From owner-dm-catalog@eso.org  Wed Jan  5 20:48:43 2005
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From: Arnold Rots <arots@head.cfa.harvard.edu>
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Subject: STC Version 1.10
To: dal@ivoa.net, dm@ivoa.net, dm-catalog@ivoa.net, registry@ivoa.net,
        voql@ivoa.net, votable@ivoa.net
Date: Wed, 5 Jan 2005 14:48:12 -0500 (EST)
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With apologies for the wide distribution - many of you will get
multiple copies of this message.  But STC does touch on many areas.


STC Version 1.10 has been posted at ivoa.net.

The Working Draft and the schemata have been modified following
comments, mainly by Anita Richards and David Berry.

The most important changes:

  Pixel Space specification
  Allow UNKNOWN for certain elements
  Allow ranges for Coordinate components other than Name and Value
  Provide for the specification of rest frequencies
  Improved generalization, inheritance, polymorphism
  Added AllSky to Region shapes

In addition, I have compiled a document that describes the XML
implementation.
This really completes the first release.  I consider this
implementation a stable version and do not envision any drastic
changes until Version 2.0.

And I have created a project page at us-vo.org:

	http://us-vo.org/projects/project.cfm?ID=62

There will be a poster on STC V1.10 at the AAS special session, next week.

Cheers,

  - Arnold

--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head.cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------

----- End of forwarded message from Arnold Rots -----
--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head.cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------

From owner-dm-catalog@eso.org  Fri Apr  1 22:43:55 2005
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From: Brian Thomas <thomas@astro.umd.edu>
To: Francois Bonnarel <bonnarel@alinda.u-strasbg.fr>
Subject: Use of Quantity, STC and Characterization within Catalog. (Was: Re: Characterization predraft in Postscript
Date: Fri, 1 Apr 2005 15:43:23 -0500
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        chil@sn.sai.msu.ru, dtody@nrao.edu, jcm@head.cfa.harvard.edu,
        louys@newb6.u-strasbg.fr, dm-catalog@ivoa.net
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	Hi All,

	I'm cross-posting this to the characterization and catalog groups as this
	work overlaps both.

	In coordination with some of the others of you, Ed and I have been working
	on trying to do a serialization/datamodel for "Catalog" which utilizes 
	existing VO datamodels (namely STC, Quantity and Characterization).

	The main problem in moving forward with the catalog work has been the
	overlapping (and conflicting) nature of the above VO datamodels. We have tried
	to resolve the most aggregious issues and create a simple source catalog.

	You can find our work (as document, schema and xml example) at the 
	following address:

	http://archive.astro.umd.edu/VOCatalogTest

	For those of you who just want to read our proposal, unified model, please
	hop to:

	http://archive.astro.umd.edu/VOCatalogTest/docs/VOModel_merger.pdf

	Cheers,

	Brian (and Ed)


On Friday 01 April 2005 07:17 am, Francois Bonnarel wrote:
> Dear Brian,
> 
> <	If you like, I would be happy to post the schema and an example 
> <	(catalog) which uses it all.
> <
> <	cheers,
>     Yes please, do it
> François
> 
> =====================================================================
> Francois   Bonnarel               Observatoire Astronomique de Strasbourg
> CDS (Centre de donnees          11, rue de l'Universite
> astronomiques de Strasbourg)    F--67000 Strasbourg (France)
> 
> Tel: +33-(0)3 90 24 24 11       WWW: http://cdsweb.u-strasbg.fr/people/fb.html
> Fax: +33-(0)3 90 24 24 25       E-mail: bonnarel@astro.u-strasbg.fr
> ---------------------------------------------------------------------
> 

-- 
--------------------------------------
|                                     
| Dr. Brian Thomas                    
|                                     
| Dept of Astronomy                   
| University of Maryland-College Park 
|
| Phone: (301) 405-2312               
| Fax: (301) 314-9067                 
|                                     
--------------------------------------

From owner-dm-catalog@eso.org  Fri Apr  1 23:35:41 2005
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From: Brian Thomas <brian.thomas@gsfc.nasa.gov>
To: Francois Bonnarel <bonnarel@alinda.u-strasbg.fr>
Subject: Re: Use of Quantity, STC and Characterization within Catalog. (Was: Re: Characterization predraft in Postscript
Date: Fri, 1 Apr 2005 16:35:42 -0500
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	Oops. Sorry, I screwed up the document URL, the *working* one is:

http://archive.astro.umd.edu/VOCatalogTest/docs/VOmodel_merger.pdf

	 =b.t.

On Friday 01 April 2005 03:43 pm, Brian Thomas wrote:
> 
> 	Hi All,
> 
> 	I'm cross-posting this to the characterization and catalog groups as this
> 	work overlaps both.
> 
> 	In coordination with some of the others of you, Ed and I have been working
> 	on trying to do a serialization/datamodel for "Catalog" which utilizes 
> 	existing VO datamodels (namely STC, Quantity and Characterization).
> 
> 	The main problem in moving forward with the catalog work has been the
> 	overlapping (and conflicting) nature of the above VO datamodels. We have tried
> 	to resolve the most aggregious issues and create a simple source catalog.
> 
> 	You can find our work (as document, schema and xml example) at the 
> 	following address:
> 
> 	http://archive.astro.umd.edu/VOCatalogTest
> 
> 	For those of you who just want to read our proposal, unified model, please
> 	hop to:
> 
> 	http://archive.astro.umd.edu/VOCatalogTest/docs/VOModel_merger.pdf
> 
> 	Cheers,
> 
> 	Brian (and Ed)
> 
> 
> On Friday 01 April 2005 07:17 am, Francois Bonnarel wrote:
> > Dear Brian,
> > 
> > <	If you like, I would be happy to post the schema and an example 
> > <	(catalog) which uses it all.
> > <
> > <	cheers,
> >     Yes please, do it
> > François
> > 
> > =====================================================================
> > Francois   Bonnarel               Observatoire Astronomique de Strasbourg
> > CDS (Centre de donnees          11, rue de l'Universite
> > astronomiques de Strasbourg)    F--67000 Strasbourg (France)
> > 
> > Tel: +33-(0)3 90 24 24 11       WWW: http://cdsweb.u-strasbg.fr/people/fb.html
> > Fax: +33-(0)3 90 24 24 25       E-mail: bonnarel@astro.u-strasbg.fr
> > ---------------------------------------------------------------------
> > 
> 

-- 
--------------------------------------
|                                     
| Dr. Brian Thomas                    
|                                     
| Dept of Astronomy                   
| University of Maryland-College Park 
|
| Phone: (301) 405-2312               
| Fax: (301) 314-9067                 
|                                     
--------------------------------------

From owner-dm-catalog@eso.org  Mon Apr  4 11:51:39 2005
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Date: Mon, 04 Apr 2005 11:50:53 +0200
From: Pedro Osuna <Pedro.Osuna@sciops.esa.int>
Subject: Re: Use of Quantity, STC and Characterization within Catalog.	(Was:
 Re: Characterization predraft in Postscript
In-reply-to: <200504011543.23542.thomas@astro.umd.edu>
To: Brian Thomas <thomas@astro.umd.edu>
Cc: Pedro.Osuna@esa.int, Francois Bonnarel <bonnarel@alinda.u-strasbg.fr>,
        Ed Shaya <edward.j.shaya.1@gsfc.nasa.gov>,
        Alberto Micol <Alberto.Micol@eso.org>, arots@head.cfa.harvard.edu,
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Dear Brian,

thank you for circulating your work on a possible Catalogue DM.

As you know, the Catalogue Data Model subgroup presented a draft
proposal to approach the Catalogue Data Model, which I discussed with
you -and others- during the ADASS at Pasadena.

Your proposal matches quite well that one, and I think it would be
interesting to have it uploaded to the Catalogue Data Model pages. 

I think Kyoto would be the right place to discuss about the merging of
the different proposals. I will ask Jonathan to book some time for this
in the DM general group.

On our side -am now talking as ESA VO, not Catalogue DM chair- we are
preparing a Data Model for Sources. We will circulate it soon.


Please let me know if you're OK with uploading the info to the Catalogue
pages or you want me to do it.


Thank you.

Cheers,
P.

 
On Fri, 2005-04-01 at 22:43, Brian Thomas wrote:
> 	Hi All,
> 
> 	I'm cross-posting this to the characterization and catalog groups as this
> 	work overlaps both.
> 
> 	In coordination with some of the others of you, Ed and I have been working
> 	on trying to do a serialization/datamodel for "Catalog" which utilizes 
> 	existing VO datamodels (namely STC, Quantity and Characterization).
> 
> 	The main problem in moving forward with the catalog work has been the
> 	overlapping (and conflicting) nature of the above VO datamodels. We have tried
> 	to resolve the most aggregious issues and create a simple source catalog.
> 
> 	You can find our work (as document, schema and xml example) at the 
> 	following address:
> 
> 	http://archive.astro.umd.edu/VOCatalogTest
> 
> 	For those of you who just want to read our proposal, unified model, please
> 	hop to:
> 
> 	http://archive.astro.umd.edu/VOCatalogTest/docs/VOModel_merger.pdf
> 
> 	Cheers,
> 
> 	Brian (and Ed)
> 
> 
> On Friday 01 April 2005 07:17 am, Francois Bonnarel wrote:
> > Dear Brian,
> > 
> > <	If you like, I would be happy to post the schema and an example 
> > <	(catalog) which uses it all.
> > <
> > <	cheers,
> >     Yes please, do it
> > FranÃ§ois
> > 
> > =====================================================================
> > Francois   Bonnarel               Observatoire Astronomique de Strasbourg
> > CDS (Centre de donnees          11, rue de l'Universite
> > astronomiques de Strasbourg)    F--67000 Strasbourg (France)
> > 
> > Tel: +33-(0)3 90 24 24 11       WWW: http://cdsweb.u-strasbg.fr/people/fb.html
> > Fax: +33-(0)3 90 24 24 25       E-mail: bonnarel@astro.u-strasbg.fr
> > ---------------------------------------------------------------------
> > 
-- 
Pedro Osuna Alcalaya

 
Software Engineer
Science Archive Team
European Space Astronomy Centre
(ESAC/ESA)
e-mail: Pedro.Osuna@esa.int
Tel + 34 91 8131314
---------------------------------                                                                                
European Space Astronomy Centre
European Space Agency
P.O. Box 50727
E-28080 Villafranca del Castillo
MADRID - SPAIN

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Date: Wed, 27 Apr 2005 16:32:44 +0200
From: Pedro Osuna <Pedro.Osuna@sciops.esa.int>
Subject: [CATALOGUE] Source Catalogue DM
To: dm@ivoa.net, dm-catalog@ivoa.net
Cc: Jesus.Salgado@sciops.esa.int, Christophe.Arviset@esa.int,
        Pedro.Osuna@sciops.esa.int
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--Boundary_(ID_8tElyy3DfG5NMGKyg638uQ)
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Dear all,

Matteo Guainazzi (ESA-VO and XMM-Newton Archive Scientist) has compiled
information on several source catalogues on different wavelengths and
together with Jesus Salgado an myself we have compiled a tentative
Source Catalogue Data Model, that would plug in the general Catalogue 
Data Model that we discussed back in Pune.

We attach a UML diagram of the model to serve as a starting point for
discussion. 

You will see in the model that certain of the Source specific
characteristics that Matteo has identified correspond to other Data
Models that are being worked by other sub-groups.

With my Catalogue DM coordinator's hat, could I ask Jonathan (for the
SED) and Alberto (for the Observation/Characterisation) to cross check
which of the relevant items boxed in the diagram correspond to items in
their respective models? And in case they are not there, would it be
possible to add them?

A small description -by Matteo- of each of the physical attributes 
in the model follows together with a description by Jesus and myself 
on the model itself. 
The attributes' types in the model have been put for reference and 
should not be taken as definitive. 

Please do have a look to the Model and send your comments; this is the
only way to have flexible and powerful Data Models fulfilling all the
needs.

Feel free to send comments to the whole Catalogue dm group
(dm-catalog@ivoa.net) or, in case you send them to the general DM group
, do it with a subject containing the word [CATALOGUE] so that the rest 
of DM-ers can filter properly.


Cheers,
P.


++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

UML diagram
===========
Objects:
-------
Source
------
We have decided to have a quite general and big-ish object called Source
with as much information as possible inside. Smaller or finer grain
could have been obtained by separating the attributes on the Source
object to smaller objects. However, in view of the fact that the source
is just but one item in the possible "Catalogue entries", we thought
that there are already too many subdivisions, and hence decided to build
only one.

Certain attributes of the Source object will, obviously, only apply to
some sources (a clear example being, e.g., the visualAlbedo). 

The idea of the "id" is to leave a place for specific IDs for specific
projects. The standard naming for the sources should be filled in (if
known) on the SIMBADName and IAUName.

Wherever STC appears, it makes reference to certain item in the Space
Time Coordinate Data Model from Arnold.

Orbit is obviously only related to objects following an orbit, like
binary systems. In this case, a specific object has been isolated as it
might become quite big if we decide to add more specific attributes to
the orbits of the objects (some of which are very well known). In this
case, we have doubted whether any effort exists in the Data Model groups
to describe orbits in general (Jonathan: would it need to be considered
separately?).


Morphology
----------
Morphology has been separated to account for possible extended source
information. In the case that a Source is identified to be of a certain
type (for example, a Galaxy) this Galaxy model should extend the
Morphology and add more specific attributes to it (in the case of a
Galaxy, for example, whtehr the galaxy is Sprial SB, or Sa, elliptical,
irregular, etc.).

Orbit
-----
We have decided, as mentioned above, to isolate this item as it might
grow easily if we decide to give very specific information for orbits,
some of which might be very well known. For the time being, we give only
a reduced set of attributes.


STC
---
Relevant items to the Source model are specified there. Arnold should
revise their validity.

SED
---
Jonathan should revise which of the items inside this box are present in
the SED, and in case they are not, decide if they can be created.
Otherwise, we might want to create an isolated object for this.

Observation
-----------
Alberto should revise this bit and give information (as above).


AGN
---
This is not an object as such. It is a place holder for any possbile
AstronomicalObjects that we might want to describe in the future. We
agreed in the past that in many catalogues, the type of source is either
unknown or irrelevant, therefore not neededing an identification.
However, other catalogues will consist, e.g., of only galaxies, for
example. In this case, a Galaxy model should exist to which we could
point the "type" attribute of "Source". This AGN object represents one
of those future objects.

 
Physical Description of attributes
==================================

- "id":		Name of the source 

- "IAUName": 	IAU name of the source

- "SIMDABName": SIMBAD name of the identified counterpart

- "type": 	Source class. It may reflect a standard object
		classification as in e.g.: 	http://simbad.u-strasbg.fr/guide/chF.htx

- "coordinates": The sky coordinates of the source

- "frequency": 	The frequency, at which the flux/magnitude/count ("flux"
  hereafter) measurements in the catalogue were taken

- "snr": Source significance in terms of signal-to-noise ratio

- "detectionProbability": Source detection probability

- "distance": Distance of the source from "distanceOrigin". The
cosmological redshift is a possible instantiation of this attribute

- "distanceDeterminationMethod": Method employed to determine
"distance". "Spectra", "Photometric", "Parallax" are possible values of
this attribute

- "distanceOrigin": Origin from which "distance" is being measured

- "properMotion": the source proper motion on the sky vault

- "radialVelocity": the radial component of the source velocity

- "varAmplitude": the amplitude of the "varType" amplitude variability.
It can be expressed either in physical absolute, r.m.s, or in fractional
units

- "varPeriod": the type of source variability: "Periodic",
"Quasi-periodic",  "Burst of Type I", "Aperiodic" are possible values of
this attribute

- "polarisatinDegree": degree of source polarization

- "polarisationAngle": positional angle of the source polarization

- "visualAlbedo": source visual albedo

- "minorDiameter": size of the minor diameter of the source

- "majorDiameter': size of the major diameter of the source

- "inclination": angle between the line-of-sight to the source and the
  normal of the main source symmetry plane

- "positionAngle": apparent position angle of the source on the sky
vault

- "stellarityIndex": parameter ranging from 0 (galaxy) to 1 (star),
related to the probability that a given object is extended or point-like

- "form": string describing the geometrical shape and/or symmetry of the
   source. "Boxy", "Patchy", "Ring", are possible values for this 
attribute

- "perihelion": minimum distance from a reference point along the orbit

- "perihelionTime": time of the source passing through the orbit
perihelion

- "afelion": maximum distance from a reference point along the orbit

- "inclination": angle between the line-of-sight to the source and the
  normal to the plane containing the orbit

- "eccentricity": fraction of the distance along the semi-major axis at
which the focus lies (e=c/a, where c is the distance from the center of
the conic section to the focus and a is the semi-major axis)

- "positionAngle": apparent position angle of the orbit on the sky vault

- "period": orbital period



-- 
Pedro Osuna Alcalaya

 
Software Engineer
Science Archive Team
European Space Astronomy Centre
(ESAC/ESA)
e-mail: Pedro.Osuna@esa.int
Tel + 34 91 8131314
---------------------------------                                                                                
European Space Astronomy Centre
European Space Agency
P.O. Box 50727
E-28080 Villafranca del Castillo
MADRID - SPAIN

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--Boundary_(ID_8tElyy3DfG5NMGKyg638uQ)--

From owner-dm-catalog@eso.org  Thu Apr 28 19:59:31 2005
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Date: Thu, 28 Apr 2005 10:58:07 -0700
From: Steve Allen <sla@ucolick.org>
To: dm-catalog@ivoa.net
Subject: Re: [CATALOGUE] Source Catalogue DM
Message-ID: <20050428175807.GA18807@ucolick.org>
References: <1114612363.29103.20880.camel@isol03.vilspa.esa.int>
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On Wed 2005-04-27T16:32:44 +0200, Pedro Osuna hath writ:
> - "polarisatinDegree": degree of source polarization
>
> - "polarisationAngle": positional angle of the source polarization

The solar and radio observer in me asks why this omits
an indication of the circular polarization.

> - "positionAngle": apparent position angle of the source on the sky
> vault

> - "positionAngle": apparent position angle of the orbit on the sky vault

All of the "Angle" quantities require a reference to some kind of
celestial reference frame of the sort found in STC.  It is not clear
to me how that relationship can be enforced in the current schema.

--
Steve Allen          UCO/Lick Observatory       Santa Cruz, CA 95064
sla@ucolick.org      Voice: +1 831 459 3046     http://www.ucolick.org/~sla
PGP: 1024/E46978C5   F6 78 D1 10 62 94 8F 2E    49 89 0E FE 26 B4 14 93

From owner-dm-catalog@eso.org  Thu Apr 28 20:22:01 2005
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From: Arnold Rots <arots@head.cfa.harvard.edu>
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Message-Id: <200504281821.j3SILG0K012222@xebec.cfa.harvard.edu>
Subject: Re: [CATALOGUE] Source Catalogue DM
In-Reply-To: <1114612363.29103.20880.camel@isol03.vilspa.esa.int>
To: Pedro Osuna <Pedro.Osuna@sciops.esa.int>
Date: Thu, 28 Apr 2005 14:21:16 -0400 (EDT)
CC: dm@ivoa.net, dm-catalog@ivoa.net, Jesus.Salgado@sciops.esa.int,
        Christophe.Arviset@esa.int
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Pedro,

I append the mapping to the STC schema, with some additional comments.
I'll be happy to answer questions.
Hope it elucidates things.

Cheers,

  - Arnold

--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head.cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------


Source Catalog - STC Mapping
----------------------------

Following is a mapping of all elements from Pedro and Matteo's list
that are present in stc:CatalogEntryLocation.

Some preliminaries:
stc:CatalogEntryLocation was designed with the following implementation
in mind: The actual catalog data are presented as cells of a VOTable; the
stc:CatalogEntryLocation element is present in the table header and its
leafs, rather than containing actual data, are IDREFs that point to the
Field that describes the column in the table, holding the actual data.
However, there are clearly other ways of implementing things.
The element can hold multiple coordinate systems to allow, for instance,
combining equatorial and Galactic coordinates in one table; each AstroCoords
element refers to a particualr AstroCoordsSystem through an IDREF
attribute.

If distance is to be added, one may want to specify a 3-D Spherical
coordinate system with unit "deg deg Mpc", or so.  The spatial
coordinate then becomes a vector of length 3, containing RA, Dec, and
distance (or whatever spatial frame is selected).  It does allow multiple
reference frames (e.g., equatorial and Galactic).  I am assuming that
the reference position for all spatial coordinates (including distance)
is the same and most likely the barycenter - though the reference position
for redshift may be different.
Alternatively, one may want to put distance in an element with different
reference frame, like Galactic coordinates.

Proper motions are spatial velocities.  However, Doppler velocities fall
in the Redshift category.  The redshift frame in the AstroCoordSystem
specifies whether it is z or Doppler velocity, the velocity definition
used (optical, radio), and the reference origin (geocenter, barycenter,
galactic center, LSR, etc.).

I would encourage you to add errors and I have included them in the mapping.
Finally, if you use a single STC element to reference all catalog entries
you may want to consider adding an AstroCoordArea element that descibes
the volume in coordinate space covered by your catalog; I added those
mappings, too.


Mapping to stc:CatalogEntryLocation
  (not showing attributes)


coordinates (say, RA & Dec)
  CatalogEntryLocation/AstroCoords/Position2D/Value2

errors on coordinates (say, an error circle)
  CatalogEntryLocation/AstroCoords/Position2D/Error2Radius

distance
  CatalogEntryLocation/AstroCoords/Position1D/Value

error on distance
  CatalogEntryLocation/AstroCoords/Position1D/Error

proper motion (in RA and Dec)
  CatalogEntryLocation/AstroCoords/Velocity2D/Value2

errors on proper motion
  CatalogEntryLocation/AstroCoords/Velocity2D/Error2

frequency
  CatalogEntryLocation/AstroCoords/Spectral/Value

Doppler velocity
  CatalogEntryLocation/AstroCoords/Redshift/Value

error on Doppler velocity
  CatalogEntryLocation/AstroCoords/Redshift/Error

time of observation
  CatalogEntryLocation/AstroCoords/Time/TimeInstant/ISOTime
  or: CatalogEntryLocation/AstroCoords/Time/TimeInstant/JDTime

major and minor axis
  CatalogEntryLocation/AstroCoords/Position2D/Size2PA/Size

position angle
  CatalogEntryLocation/AstroCoords/Position2D/Size2PA/PosAngle

catalog coverage:
  CatalogEntryLocation/AstroCoordArea/TimeInterval
  CatalogEntryLocation/AstroCoordArea/Region
  CatalogEntryLocation/AstroCoordArea/VelInterval
  CatalogEntryLocation/AstroCoordArea/SpectralInterval
  CatalogEntryLocation/AstroCoordArea/RedshiftInterval

From owner-dm-catalog@eso.org  Thu Jun  2 14:28:23 2005
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Date: Thu, 02 Jun 2005 14:27:58 +0200
From: Alberto Micol <Alberto.Micol@eso.org>
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Subject: Re: [CATALOGUE] Source Catalogue DM
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Dear Pedro and Matteo,

I finally manage to provide the requested feedback on the 
Observation/Characterisation
part of the Catalog/Source DM you are proposing.

[Note: in the following I will type "charac" for "characterisation".]

In the first place I'd like to highlight the fact that
"Catalogue Charac." and "Source Charac" are quite different beasts,
in that the Catalogue charac is probably going to be a some kind of summary
of the characs of all the sources in the catalogue.

In the following I take care only of the Source relevant aspects, related to
charac and observation, which are:

- Source.coordinates
- Source.frequency (and bandpass?)
- Source.snr & localBackgroundNoise
- Source.observation
- Calibration accuracy
- Publications

Coordinates and frequency:
The coordinates are described using STC which cover Temporal, Spatial 
and Spectral axes.
Hence, I see the Source.frequency as a redundant field; a field that is 
there for convenience.
If that is true, then I'd suggest also to add a reference time; or 
otherwise remove frequency.
(I like too much symmetry: or we put convenient fields for each axis, or 
I'd prefer no redundant
fields at all).
BTW, I assume frequency is the rest frame frequency, is it?


Bandpass:
On the other hand, what might be missing is the bandpass name and its 
characteristics.
The fact that under Observation there is a field called Filter is not 
enough. It could
be that some transformation is applied to the extracted source, and that 
the published
flux in the catalog is no longer characterised by the filter name of the 
original observation.
Maybe we should dust off the work done by Jonathan on the bandpass DM (?)

Back to STC (or Charac [see last comment at the end of this email]):
When saying STC that implies many things which are not explicited in 
your model.
And in particular I'm concentrating on the charac aspects like 
Resolution and Sampling.
I find particularly relevant to know whether the morphological 
parameters of the source
were extracted from an undersampled or oversampled image, or otherwise 
from a low or high
resolution spectrum. Maybe that should go in the Observation box...

Observation: Spectroscopy?
The Observation diargam is probably biased towards imaging.
Spectroscopy is to be added there. Things like slit sizes, position and 
orientation
(maybe in your view accumunated under fieldOfView and positionAngle, or 
maybe Aperture?),
dispersive elements could be added.

Calibration  accuracy:
I see things like vignettingCorrection, but there are many other 
corrections one could
put in (from flatfielding to geometric distorsion corrections).
I would claim that  the source is probably extracted from a 
well-calibrated product,
where all such corrections have been performed.
Hence, I would remove the vignettingCorrection and put in  a more generic
Calibration Status, as it is done in the SSAP (Paragraph 3.3.5.2),
e.g. Accuracy.Spatial.Calibrated, Accuracy.Spatial.SysErr, etc.
I would also get rid of the gain.
To be added: the Error on the ZeroPoint.

Source.snr and localBackgroundNoise:
I see that part of the SourceDM, but I also see a localBackgroundNoise 
under Observation.
That confuses me. Could you please clarify what you mean by 
localBackgroundNoise?
In my view that belongs to the Source, not to the Observation.

Finally: Publications.
Well, maybe not. It all depends if Source means extracted source, or if 
Source means Object
(as discussed in Kyoto). In the latter case I would then add the 
bibcode(s) of the publications
from which certain quantities were derived.

An overall remark:
Should SourceDM point to STC
or to CharacDM which uses STC (and should also contemplate Accuracy)?

I would be in favour of the second approach to be inline with SSAP and 
later with SIAP.
And that would save you lot of work since you can probably 
copy-and-paste that part
into your Catalogue DM.

I think this is enough for a first pass. Sorry that it came so late!

Alberto


Pedro Osuna wrote:

>Dear all,
>
>Matteo Guainazzi (ESA-VO and XMM-Newton Archive Scientist) has compiled
>information on several source catalogues on different wavelengths and
>together with Jesus Salgado an myself we have compiled a tentative
>Source Catalogue Data Model, that would plug in the general Catalogue 
>Data Model that we discussed back in Pune.
>
>We attach a UML diagram of the model to serve as a starting point for
>discussion. 
>
>You will see in the model that certain of the Source specific
>characteristics that Matteo has identified correspond to other Data
>Models that are being worked by other sub-groups.
>
>With my Catalogue DM coordinator's hat, could I ask Jonathan (for the
>SED) and Alberto (for the Observation/Characterisation) to cross check
>which of the relevant items boxed in the diagram correspond to items in
>their respective models? And in case they are not there, would it be
>possible to add them?
>
>A small description -by Matteo- of each of the physical attributes 
>in the model follows together with a description by Jesus and myself 
>on the model itself. 
>The attributes' types in the model have been put for reference and 
>should not be taken as definitive. 
>
>Please do have a look to the Model and send your comments; this is the
>only way to have flexible and powerful Data Models fulfilling all the
>needs.
>
>Feel free to send comments to the whole Catalogue dm group
>(dm-catalog@ivoa.net) or, in case you send them to the general DM group
>, do it with a subject containing the word [CATALOGUE] so that the rest 
>of DM-ers can filter properly.
>
>
>Cheers,
>P.
>
>
>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
>UML diagram
>===========
>Objects:
>-------
>Source
>------
>We have decided to have a quite general and big-ish object called Source
>with as much information as possible inside. Smaller or finer grain
>could have been obtained by separating the attributes on the Source
>object to smaller objects. However, in view of the fact that the source
>is just but one item in the possible "Catalogue entries", we thought
>that there are already too many subdivisions, and hence decided to build
>only one.
>
>Certain attributes of the Source object will, obviously, only apply to
>some sources (a clear example being, e.g., the visualAlbedo). 
>
>The idea of the "id" is to leave a place for specific IDs for specific
>projects. The standard naming for the sources should be filled in (if
>known) on the SIMBADName and IAUName.
>
>Wherever STC appears, it makes reference to certain item in the Space
>Time Coordinate Data Model from Arnold.
>
>Orbit is obviously only related to objects following an orbit, like
>binary systems. In this case, a specific object has been isolated as it
>might become quite big if we decide to add more specific attributes to
>the orbits of the objects (some of which are very well known). In this
>case, we have doubted whether any effort exists in the Data Model groups
>to describe orbits in general (Jonathan: would it need to be considered
>separately?).
>
>
>Morphology
>----------
>Morphology has been separated to account for possible extended source
>information. In the case that a Source is identified to be of a certain
>type (for example, a Galaxy) this Galaxy model should extend the
>Morphology and add more specific attributes to it (in the case of a
>Galaxy, for example, whtehr the galaxy is Sprial SB, or Sa, elliptical,
>irregular, etc.).
>
>Orbit
>-----
>We have decided, as mentioned above, to isolate this item as it might
>grow easily if we decide to give very specific information for orbits,
>some of which might be very well known. For the time being, we give only
>a reduced set of attributes.
>
>
>STC
>---
>Relevant items to the Source model are specified there. Arnold should
>revise their validity.
>
>SED
>---
>Jonathan should revise which of the items inside this box are present in
>the SED, and in case they are not, decide if they can be created.
>Otherwise, we might want to create an isolated object for this.
>
>Observation
>-----------
>Alberto should revise this bit and give information (as above).
>
>
>AGN
>---
>This is not an object as such. It is a place holder for any possbile
>AstronomicalObjects that we might want to describe in the future. We
>agreed in the past that in many catalogues, the type of source is either
>unknown or irrelevant, therefore not neededing an identification.
>However, other catalogues will consist, e.g., of only galaxies, for
>example. In this case, a Galaxy model should exist to which we could
>point the "type" attribute of "Source". This AGN object represents one
>of those future objects.
>
> 
>Physical Description of attributes
>==================================
>
>- "id":		Name of the source 
>
>- "IAUName": 	IAU name of the source
>
>- "SIMDABName": SIMBAD name of the identified counterpart
>
>- "type": 	Source class. It may reflect a standard object
>		classification as in e.g.: 	http://simbad.u-strasbg.fr/guide/chF.htx
>
>- "coordinates": The sky coordinates of the source
>
>- "frequency": 	The frequency, at which the flux/magnitude/count ("flux"
>  hereafter) measurements in the catalogue were taken
>
>- "snr": Source significance in terms of signal-to-noise ratio
>
>- "detectionProbability": Source detection probability
>
>- "distance": Distance of the source from "distanceOrigin". The
>cosmological redshift is a possible instantiation of this attribute
>
>- "distanceDeterminationMethod": Method employed to determine
>"distance". "Spectra", "Photometric", "Parallax" are possible values of
>this attribute
>
>- "distanceOrigin": Origin from which "distance" is being measured
>
>- "properMotion": the source proper motion on the sky vault
>
>- "radialVelocity": the radial component of the source velocity
>
>- "varAmplitude": the amplitude of the "varType" amplitude variability.
>It can be expressed either in physical absolute, r.m.s, or in fractional
>units
>
>- "varPeriod": the type of source variability: "Periodic",
>"Quasi-periodic",  "Burst of Type I", "Aperiodic" are possible values of
>this attribute
>
>- "polarisatinDegree": degree of source polarization
>
>- "polarisationAngle": positional angle of the source polarization
>
>- "visualAlbedo": source visual albedo
>
>- "minorDiameter": size of the minor diameter of the source
>
>- "majorDiameter': size of the major diameter of the source
>
>- "inclination": angle between the line-of-sight to the source and the
>  normal of the main source symmetry plane
>
>- "positionAngle": apparent position angle of the source on the sky
>vault
>
>- "stellarityIndex": parameter ranging from 0 (galaxy) to 1 (star),
>related to the probability that a given object is extended or point-like
>
>- "form": string describing the geometrical shape and/or symmetry of the
>   source. "Boxy", "Patchy", "Ring", are possible values for this 
>attribute
>
>- "perihelion": minimum distance from a reference point along the orbit
>
>- "perihelionTime": time of the source passing through the orbit
>perihelion
>
>- "afelion": maximum distance from a reference point along the orbit
>
>- "inclination": angle between the line-of-sight to the source and the
>  normal to the plane containing the orbit
>
>- "eccentricity": fraction of the distance along the semi-major axis at
>which the focus lies (e=c/a, where c is the distance from the center of
>the conic section to the focus and a is the semi-major axis)
>
>- "positionAngle": apparent position angle of the orbit on the sky vault
>
>- "period": orbital period
>
>
>
>  
>
-- 
Alberto.Micol@eso.org                         Tel: +49 89 32006365
HST Archive Scientist     ST-ECF              Fax: +49 89 32006480
ESA/RSSD/SN               c/o ESO             Karl Schwarzschild Str.2,
http://archive.eso.org/                       Garching bei Muenchen,
http://www.stecf.org/                         D-85748 Germany


From owner-dm-catalog@eso.org  Thu Jun  2 16:40:57 2005
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Date: Thu, 02 Jun 2005 16:39:03 +0200
From: "Marco C. Leoni" <mleoni@eso.org>
Organization: European Virtual Observatory @ESO
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To: dm-catalog@ivoa.net
Subject: Re: [CATALOGUE] Source Catalogue DM
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This is a multi-part message in MIME format.
--------------060704030600000104080902
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It would be very nice to stop the cross-posting.

It's almost always rather annoying than useful:like in this case.
    - Most of the people registered to "dm-catalog" is already on "dm".
    - The subject says "[CATALOGUE]", thus why bother all the other?
    [- If it's really needed, please do it with a separate email]

In case sending to "sub-list" always requires CC "list", the only option 
is to remove the sub-list.


Thanks a lot,
    Marco

--------------060704030600000104080902
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000066">
<font face="Helvetica, Arial, sans-serif">It would be very nice to stop
the cross-posting.<br>
<br>
It's almost always rather annoying than useful:like in this case.<br>
&nbsp;&nbsp;&nbsp; - Most of the people registered to "dm-catalog" is already on "dm".<br>
&nbsp;&nbsp;&nbsp; - The subject says "[CATALOGUE]", thus why bother all the other?<br>
&nbsp;&nbsp;&nbsp; [- If it's really needed, please do it with a separate email]<br>
<br>
In case sending to "sub-list" always requires CC "list", the only
option is to remove the sub-list.<br>
<br>
<br>
Thanks a lot,<br>
&nbsp;&nbsp;&nbsp; Marco</font>
</body>
</html>

--------------060704030600000104080902--

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Date: Thu, 02 Jun 2005 16:56:58 +0200
From: Pedro Osuna <Pedro.Osuna@sciops.esa.int>
Subject: Re: [CATALOGUE] Source Catalogue DM
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Yes, I do agree. 

Please send dm-catalog related things to dm-catalog only.

Cheers,
P.


On Thu, 2005-06-02 at 16:39, Marco C. Leoni wrote:
> It would be very nice to stop the cross-posting.
> 
> It's almost always rather annoying than useful:like in this case.
>     - Most of the people registered to "dm-catalog" is already on
> "dm".
>     - The subject says "[CATALOGUE]", thus why bother all the other?
>     [- If it's really needed, please do it with a separate email]
> 
> In case sending to "sub-list" always requires CC "list", the only
> option is to remove the sub-list.
> 
> 
> Thanks a lot,
>     Marco
-- 
Pedro Osuna Alcalaya

ESA 
Science Archives System Engineer
Science Archive Team
European Space Astronomy Centre
(ESAC/ESA)
e-mail: Pedro.Osuna@esa.int
Tel + 34 91 8131314
---------------------------------                                                                                
European Space Astronomy Centre
European Space Agency
P.O. Box 50727
E-28080 Villafranca del Castillo
MADRID - SPAIN

From owner-dm-catalog@eso.org  Thu Jun 16 17:23:22 2005
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Minor quibble in case it is propagated in a schema

"afelion"

is incorrect, even as a simpified spelling of aphelion since ap-helion is ap + 
helion and never pronounced afelion

I am sure we all know that but XML doesn't

cheers
a

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Dr. Anita M. S. 
Richards, AstroGrid Astronomer
MERLIN/VLBI National Facility, University of Manchester, Jodrell Bank 
Observatory, Macclesfield, Cheshire SK11 9DL, U.K. tel +44 (0)1477 572683 
(direct); 571321 (switchboard); 571618 (fax).

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Good catch Anita!

- Kirk


> From owner-dm-catalog@eso.org Thu Jun 16 11:24:50 2005
> Date: Thu, 16 Jun 2005 16:22:54 +0100 (BST)
> From: Anita Richards <amsr@jb.man.ac.uk>
> X-X-Sender: amsr@localhost.localdomain
> To: dm-catalog@ivoa.net
> Subject: re Source Catalogue DM 
> 
> 
> Minor quibble in case it is propagated in a schema
> 
> "afelion"
> 
> is incorrect, even as a simpified spelling of aphelion since ap-helion is ap +
> helion and never pronounced afelion
> 
> I am sure we all know that but XML doesn't
> 
> cheers
> a
> 
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Dr. Anita M. S. 
> Richards, AstroGrid Astronomer
> MERLIN/VLBI National Facility, University of Manchester, Jodrell Bank 
> Observatory, Macclesfield, Cheshire SK11 9DL, U.K. tel +44 (0)1477 572683 
> (direct); 571321 (switchboard); 571618 (fax).

From owner-dm-catalog@eso.org  Thu Sep 15 13:48:12 2005
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Some very belated comments - sorry!

I appreciate the way that the model was drawn up with reference to some 
real source catalogues.  However, I think  that some of the fields 
suggested are too 'fine grained'.  I note these below.  Maybe that means 
that there is a need for a heirachical model with generic properties at 
the top level and more domain-specific properties in optional plug-ins. 
The use case which I am thinking of arises from RadioNet discussions about 
a Common Proposal Tool, and what we need to specify an observing target.

What sruck me was that I imagined that the model was 'source-centred' - 
i.e. it should aim to provide information about an astronomical detection 
_or_ a generic model object - but it should not duplicate the role of the 
Observation and other DMs.

Detailed comments:

Morphology
Distinguish between observational properties and classifications!
Observational properties are maybe major and minor axes and position angle 
(which is conventionally measured from N through E, I am sure that this is 
defined in STC), or alternatively a series of vertices to define a polygon 
(for very large objects like molecular clouds or 3C radio galaxies...)

This morphology is specific to a particular wavelength domain (and 
possibly resolution) so this needs to be tied.

Classifications like Galaxy should be a completely separate set of 
elements - at the moment you have 'AGN' as a place holder, I suggest that 
there is an element like
sourceClassification to hold this place - or in fact it is covered by 
"type"?  This should be simplified to come in one place, anyway.

Orbit
My inclination would be to just have a flag whcih says if this is relevant 
- in fact, maybe it should be just "d(position)/d(time)" - to cover other 
kinds of proper motion - and provide a link to an ephemeris or other 
source of information.  In fact maybe this should all come under the 
properMotion  object.

Note that, thus, no all objects have a coordinate-based IAU name (although 
there are other conventions)

Similarly there should be a "d(flux)/d(time)" element which just provides 
a link e.g. for variable stars.
"varAmplitude" etc. are both too specific (for a generic source model) and 
too vague (to actually observe you need to know the time of phase zero 
etc.  Also they are wavelength-specific.

Thus I just want a flg and a reference to say if I need to look at the 
possibility that an object moves or varies with time - not a crude summary 
which will probably be misleading.

We have to be careful that we are allowing people to find and use data and 
resources - not duplicagte them!

SED
Maybe Jonathan has some ideas on this, but otherwise I think that what we 
need is
a) Flux density/wavelength data - but we don;t want to get 
too complicated, maybe just one value per Registry bin (radio-mm-IR 
etc...) - there should also be a reference for each value.  Resolution and 
limiting noise could also be given
b) If high resolution spectra (i.e. relating to molecular, 
atomic/electronic, nuclear or other line transitions) are available - 
links

"snr"
This is only meaningful for a specific observation and would be coverd by 
SED a)
"detectionProbability" and anything that speific belong in individual 
observation models.


The same goes for many of the detailed attributes lower down in the model.

I hope that this is not too disruptive, I think that we need some use 
cases of using the model to retrieve information, not just based on 
existing catalogues.  Otherwise we are on the way to reproducing the whole 
UCD system!

thanks
a



- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
Dr. Anita M. S. Richards, AstroGrid Astronomer
MERLIN/VLBI National Facility, University of Manchester, 
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K. 
tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).

From owner-dm-catalog@eso.org  Thu Sep 15 16:06:08 2005
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From: Brian Thomas <thomas@astro.umd.edu>
Organization: University of Maryland
To: dm-catalog@ivoa.net
Subject: Quantity-based catalog model (Was: Re: Source Catalogue DM)
Date: Thu, 15 Sep 2005 10:09:01 -0400
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	Anita, All,

On Thursday 15 September 2005 07:45 am, Anita Richards wrote:
> I appreciate the way that the model was drawn up with reference to some 
> real source catalogues.  However, I think  that some of the fields 
> suggested are too 'fine grained'.  I note these below.  Maybe that means 
> that there is a need for a heirachical model with generic properties at 
> the top level and more domain-specific properties in optional plug-ins. 

	I agree completely. I (and Ed) have been working on a model which allows
	adoption of the format desired by (prior) proposal, but is expandable/
	changeable to meet other needs, in particular all the various catalogs
	which we have at our site (> 4000) which don't neatly fall into 
	the prior design.

	Towards this end, I have put together a model which contains a
	number of components, and utilizes the Quantity to represent the 
	various fields in the catalog, and works well (so far) to represent 
	the contents of over a 100 catalogs from the CDS/ADC archive. I plan 
	to present this work at the ADASS/IVOA meetings this coming October. 

	Some early documents, examples and schema (some which are now out of 
	date, but do a fair job of representing the scope of the work) may be 
	found at the following link:

	http://archive.astro.umd.edu/VOCatalog
 
> 
> What sruck me was that I imagined that the model was 'source-centred' - 
> i.e. it should aim to provide information about an astronomical detection 
> _or_ a generic model object - but it should not duplicate the role of the 
> Observation and other DMs.

	Well, the catalog model should adopt structures which are components
	of the other models. For starters, I believe that proper catalogs need the 
	'characterization', 'publication/reference', 'history/provenance' components.
	The model which Ed and I have been designing does just this.

	=brian

-- 
--------------------------------------
|                                     
| Dr. Brian Thomas                    
|                                     
| Dept of Astronomy                   
| University of Maryland-College Park 
|
| Phone: (301) 405-2312               
| Fax: (301) 314-9067                 
|                                     
--------------------------------------

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From: "Jesus J. Salgado" <Jesus.Salgado@sciops.esa.int>
Subject: Re: Quantity-based catalog model (Was: Re: Source Catalogue DM)
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Dear All,

Neither Pedro nor Matteo are here until next Monday, but I would like to
give my opinion about Anita's (only the preliminary ones) and Ed's
comments.

Even when I agree some of the fields are too 'fine grained', the idea of
the data model sent (in this case, a "Source data model" more than the
total "Source Catalog data model" as we talked months ago) is, in my
opinion, to identify the items that could describe a "Source", e.g., to 
have a concrete representation of the data. Of course, which ones (and
which not) are these fields is something to be decided, and your inputs
will help a lot to improve the model.

In the case of the Source catalog data model presented by Brian and Ed,
the "source" object is only (basically) a list of quantities. Of course,
this is quite flexible as most of the catalogs are presented as tables
and a quantity can describe without problems a field in a table (among
other things). 

However, it does not solve the question of what do you need to describe
a Source (it only leaves a placeholder to add all the properties that
the source could have, but without trying to define them). I think we
need something more detailed if we want to use this data model as a base
to inter-operate in the future.

On the other hand, Brian and Ed are doing a good work trying to identify
the links from the general Source data model to other data models
(Publications, Provenance,.. etc).

As Pedro presented in Poona:
http://www.ivoa.net/internal/IVOA/IVAODMCatalogsWP/Poona_2004_Catalogue_DM.pdf

(page 5)
possible links to provenance, curator, registry or other VO data models
are needed and there were some placeholders for those kind of
connections to be identified.

In the same graph (in the image inside red circles), four different
items were identified as "complex": the catalog general model (it
depends it you want to allow recursive references) (it was finally
decided to start with a not recursive model), "Astronomical Event",
"Astronomical Object" and, finally, "Source". As the catalog data model
was, more or less, restricted to be, at the end, a source catalog data
model, it was important to start finding a model for this last item.
 

Best Regards,
Jesus Salgado

On Thu, 2005-09-15 at 16:09, Brian Thomas wrote:
> 	Anita, All,
> 
> On Thursday 15 September 2005 07:45 am, Anita Richards wrote:
> > I appreciate the way that the model was drawn up with reference to some 
> > real source catalogues.  However, I think  that some of the fields 
> > suggested are too 'fine grained'.  I note these below.  Maybe that means 
> > that there is a need for a heirachical model with generic properties at 
> > the top level and more domain-specific properties in optional plug-ins. 
> 
> 	I agree completely. I (and Ed) have been working on a model which allows
> 	adoption of the format desired by (prior) proposal, but is expandable/
> 	changeable to meet other needs, in particular all the various catalogs
> 	which we have at our site (> 4000) which don't neatly fall into 
> 	the prior design.
> 
> 	Towards this end, I have put together a model which contains a
> 	number of components, and utilizes the Quantity to represent the 
> 	various fields in the catalog, and works well (so far) to represent 
> 	the contents of over a 100 catalogs from the CDS/ADC archive. I plan 
> 	to present this work at the ADASS/IVOA meetings this coming October. 
> 
> 	Some early documents, examples and schema (some which are now out of 
> 	date, but do a fair job of representing the scope of the work) may be 
> 	found at the following link:
> 
> 	http://archive.astro.umd.edu/VOCatalog
>  
> > 
> > What sruck me was that I imagined that the model was 'source-centred' - 
> > i.e. it should aim to provide information about an astronomical detection 
> > _or_ a generic model object - but it should not duplicate the role of the 
> > Observation and other DMs.
> 
> 	Well, the catalog model should adopt structures which are components
> 	of the other models. For starters, I believe that proper catalogs need the 
> 	'characterization', 'publication/reference', 'history/provenance' components.
> 	The model which Ed and I have been designing does just this.
> 
> 	=brian
-- 
Jesus J. Salgado


ESAC Science Archive Team
e-mail: Jesus.Salgado@sciops.esa.int
Tel + 34 91 8131271

European Space Agency/European Science Astronomy Centre
VILLAFRANCA Satellites Tracking Station
P.O. Box 50727
E-28080 Villafranca del Castillo
MADRID - SPAIN

From owner-dm-catalog@eso.org  Thu Sep 15 19:11:46 2005
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From: Brian Thomas <thomas@astro.umd.edu>
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To: dm-catalog@ivoa.net
Subject: Nature of the catalogs (Was: Re: Quantity-based catalog model (Was: Re: Source Catalogue DM))
Date: Thu, 15 Sep 2005 13:14:48 -0400
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On Thursday 15 September 2005 12:19 pm, Jesus J. Salgado wrote:
> However, it does not solve the question of what do you need to describe
> a Source (it only leaves a placeholder to add all the properties that
> the source could have, but without trying to define them). I think we
> need something more detailed if we want to use this data model as a base
> to inter-operate in the future.
> 

	Jesus,

	It is true, we have tried to side-step defining what a "source" actually
	is, and for the near-term, we are happy to start with the Salgado/Osuna/etc
	model. As you indicate, part of the reason for our side-stepping
	of this issue was to be able to get to critical structural issues for how to 
	construct a general purpose collection/catalog model. Presumably (at least, 
	we presume :) this model should be reusable to hold more than just sources.

	I think the debate about sources is whether we prefer to have catalogs hold
	objects which are oriented towards observational characteristics only, or can
	we not have theoretical ones (e.g. I may want to construct a catalog of 'galaxies' or 
	'stars'). I believe we want both, and that we will want to have catalogs which
	are virtual views of other catalogs (for example, a catalog of galaxies which is
	cobbled together from several separate source catalogs). Our model is designed
	with this intention (although still some work to do in this direction, and as always,
	we are happy to collaborate :)

	On a related note: what DM -related activity will happen at the IVOA? I haven't seen
	any information about meetings, etc (perhaps as usual hopelessly out of the loop).
	I would definitely like to discuss the catalog/collection issues in depth while in Spain!

	Regards,

	=b.t.

-- 
--------------------------------------
|                                     
| Dr. Brian Thomas                    
|                                     
| Dept of Astronomy                   
| University of Maryland-College Park 
|
| Phone: (301) 405-2312               
| Fax: (301) 314-9067                 
|                                     
--------------------------------------

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Date: Fri, 16 Sep 2005 16:01:56 +0200
From: Pedro Osuna <Pedro.Osuna@sciops.esa.int>
Subject: Re: Nature of the catalogs (Was: Re: Quantity-based catalog model
	(Was: Re: Source Catalogue DM))
In-reply-to: <200509151314.48608.thomas@astro.umd.edu>
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Dear all,

I am glad to see there start to be reactions on the Source Catalogue DM.

As you may know, it was agreed that the Catalogue Data Model subgroup of
the IVOA Data Model group would start by trying to define a Source Data
Model as a first step toward demonstrating the usability of a general
Catalogue Data Model.

There were loads of discussions on whether we were trying to model
tables, or whether a Catalogue is a table, or what the differences are
between VOTables and Catalogues, etc. You can see all those discussions
at:
http://www.ivoa.net/internal/IVOA/IVAODMCatalogsWP/Catalogue_DM_mails.txt

All these issues were discussed and it was agreed that we ought to start
by the most required and possibly useful type of catalogue model: the
one for Sources (please check the page:
http://www.ivoa.net/twiki/bin/view/IVOA/IVAODMCatalogsWP).

The only inputs received for this specific Source DM were compiled into
a model that was presented to you in Kyoto, where I insisted (Jonathan,
do not parody this....) on the need to receive more inputs to build a
solid and useful DM for everyone. 

This tries to give you an explanation on the "granularity" mentioned by
Anita and why we did go to try the Source data model. I will send my own
inputs on a separate mail on the specific issues mentioned by Anita.

With respect to the possible reactivation of work in the group, and in
view that it seems to be still some glowing embers of interest, I will
try to grab some of you during the ADASS/Interop meeting here in Madrid,
to try to find a common approach to the whole issue. In particular I
would like Brian and/or Ed plus others to be there. Will that be
possible, Brian? In case you're not coming, could Jonathan collect your
inputs/ideas/complaints and transmit them? I believe Brian/Ed model fits
in naturally in a possible general IVOA Catalogue DM and also in the
Source DM and we only have to find out how to marry the different
structures.


I will send some of you a separate mail trying to fix some date for
discussion in Madrid.

Cheers,
P.


On Thu, 2005-09-15 at 19:14, Brian Thomas wrote:
> On Thursday 15 September 2005 12:19 pm, Jesus J. Salgado wrote:
> > However, it does not solve the question of what do you need to describe
> > a Source (it only leaves a placeholder to add all the properties that
> > the source could have, but without trying to define them). I think we
> > need something more detailed if we want to use this data model as a base
> > to inter-operate in the future.
> > 
> 
> 	Jesus,
> 
> 	It is true, we have tried to side-step defining what a "source" actually
> 	is, and for the near-term, we are happy to start with the Salgado/Osuna/etc
> 	model. As you indicate, part of the reason for our side-stepping
> 	of this issue was to be able to get to critical structural issues for how to 
> 	construct a general purpose collection/catalog model. Presumably (at least, 
> 	we presume :) this model should be reusable to hold more than just sources.
> 
> 	I think the debate about sources is whether we prefer to have catalogs hold
> 	objects which are oriented towards observational characteristics only, or can
> 	we not have theoretical ones (e.g. I may want to construct a catalog of 'galaxies' or 
> 	'stars'). I believe we want both, and that we will want to have catalogs which
> 	are virtual views of other catalogs (for example, a catalog of galaxies which is
> 	cobbled together from several separate source catalogs). Our model is designed
> 	with this intention (although still some work to do in this direction, and as always,
> 	we are happy to collaborate :)
> 
> 	On a related note: what DM -related activity will happen at the IVOA? I haven't seen
> 	any information about meetings, etc (perhaps as usual hopelessly out of the loop).
> 	I would definitely like to discuss the catalog/collection issues in depth while in Spain!
> 
> 	Regards,
> 
> 	=b.t.
-- 
Pedro Osuna Alcalaya

ESA 
Science Archives System Engineer
Science Archive Team
European Space Astronomy Centre
(ESAC/ESA)
e-mail: Pedro.Osuna@esa.int
Tel + 34 91 8131314
---------------------------------                                                                                
European Space Astronomy Centre
European Space Agency
P.O. Box 50727
E-28080 Villafranca del Castillo
MADRID - SPAIN

From owner-dm-catalog@eso.org  Fri Sep 16 16:37:44 2005
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Subject: DM ADASS/IVOA meetings in Oct? (Was: Re: Nature of the catalogs (Was: Re: Quantity-based catalog model (Was: Re: Source Catalogue DM))
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	Hi Pedro,

On Friday 16 September 2005 10:01 am, Pedro Osuna wrote:
> With respect to the possible reactivation of work in the group, and in
> view that it seems to be still some glowing embers of interest, I will
> try to grab some of you during the ADASS/Interop meeting here in Madrid,
> to try to find a common approach to the whole issue. In particular I
> would like Brian and/or Ed plus others to be there. Will that be
> possible, Brian? In case you're not coming, could Jonathan collect your
> inputs/ideas/complaints and transmit them? I believe Brian/Ed model fits
> in naturally in a possible general IVOA Catalogue DM and also in the
> Source DM and we only have to find out how to marry the different
> structures.
> 

	Sure. I will be in Madrid (Ed will not) and am quite willing to devote
	as much time as needed to discuss catalog issues (can't imagine
	it will be all sorted out in one hour!! How much time are you budgeting?)
	From my point of view, it would be highly desirable to have the Observations
	people present, so that the various component parts can be gone over 
	that both models may be sharing (and these components broken up into 
	working groups of interested people).

	But there is more DM-related work that expands beyond the catalog specifically
	that meetings should be held for IMO. Some things I would like to see discussed
	include a discussion by the DM group to move towards next-generation STC (e.g.
	breaking up  the STC into 2 or 3 parts...its way too large a model!), having the 
	Quantity model adopted/finalized and transitioning Q into STC and characterization
	models (on this last point I have already released example schema of how this may 
	be done some time ago). And thats my short list of priorities... hopefully Jonathan 
	will/is setting time aside for some discussions like these..

	At any rate, I plan to release updated catalog/collection model materials which 
	will include more example (validated) catalogs from the CDS/ADC holdings in 
	about a week or so. I will update the DM list when that happens. 

	See you in Madrid!

	=b.t.

-- 
--------------------------------------
|                                     
| Dr. Brian Thomas                    
|                                     
| Dept of Astronomy                   
| University of Maryland-College Park 
|
| Phone: (301) 405-2312               
| Fax: (301) 314-9067                 
|                                     
--------------------------------------

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Date: Fri, 16 Sep 2005 16:53:10 +0200
From: Pedro Osuna <Pedro.Osuna@sciops.esa.int>
Subject: Re: DM ADASS/IVOA meetings in Oct? (Was: Re: Nature of the	catalogs
 (Was: Re: Quantity-based catalog model (Was: Re: Source Catalogue	DM))
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Hi Brian,


I'll try to set-up things for a not-too-short neither-killing meeting.

On your request to discuss about other DM-related issues, I am also
willing to discuss with the different subgroups how we should link the
different models, but this is up to Jonathan to plan......

See you in Madrid then...
Cheers,
P.



On Fri, 2005-09-16 at 16:40, Brian Thomas wrote:
> 	Hi Pedro,
> 
> On Friday 16 September 2005 10:01 am, Pedro Osuna wrote:
> > With respect to the possible reactivation of work in the group, and in
> > view that it seems to be still some glowing embers of interest, I will
> > try to grab some of you during the ADASS/Interop meeting here in Madrid,
> > to try to find a common approach to the whole issue. In particular I
> > would like Brian and/or Ed plus others to be there. Will that be
> > possible, Brian? In case you're not coming, could Jonathan collect your
> > inputs/ideas/complaints and transmit them? I believe Brian/Ed model fits
> > in naturally in a possible general IVOA Catalogue DM and also in the
> > Source DM and we only have to find out how to marry the different
> > structures.
> > 
> 
> 	Sure. I will be in Madrid (Ed will not) and am quite willing to devote
> 	as much time as needed to discuss catalog issues (can't imagine
> 	it will be all sorted out in one hour!! How much time are you budgeting?)
> 	From my point of view, it would be highly desirable to have the Observations
> 	people present, so that the various component parts can be gone over 
> 	that both models may be sharing (and these components broken up into 
> 	working groups of interested people).
> 
> 	But there is more DM-related work that expands beyond the catalog specifically
> 	that meetings should be held for IMO. Some things I would like to see discussed
> 	include a discussion by the DM group to move towards next-generation STC (e.g.
> 	breaking up  the STC into 2 or 3 parts...its way too large a model!), having the 
> 	Quantity model adopted/finalized and transitioning Q into STC and characterization
> 	models (on this last point I have already released example schema of how this may 
> 	be done some time ago). And thats my short list of priorities... hopefully Jonathan 
> 	will/is setting time aside for some discussions like these..
> 
> 	At any rate, I plan to release updated catalog/collection model materials which 
> 	will include more example (validated) catalogs from the CDS/ADC holdings in 
> 	about a week or so. I will update the DM list when that happens. 
> 
> 	See you in Madrid!
> 
> 	=b.t.
-- 
Pedro Osuna Alcalaya

ESA 
Science Archives System Engineer
Science Archive Team
European Space Astronomy Centre
(ESAC/ESA)
e-mail: Pedro.Osuna@esa.int
Tel + 34 91 8131314
---------------------------------                                                                                
European Space Astronomy Centre
European Space Agency
P.O. Box 50727
E-28080 Villafranca del Castillo
MADRID - SPAIN

From owner-dm-catalog@eso.org  Thu Sep 22 21:37:19 2005
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From: Brian Thomas <thomas@astro.umd.edu>
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To: voql@ivoa.net
Subject: Re: VO Catalog presentation
Date: Thu, 22 Sep 2005 10:52:12 -0400
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	Just so as to head of any other false controversy...

On Wednesday 21 September 2005 01:39 pm, Maria A. Nieto-Santisteban wrote:
> Ok. We will allocate you a 10' slot.
> 

	Thank you.

> I would be nice you or/and others could give us an update about where the 
> Catalog DM stand nonetheless

	That should be Pedro's job. As I wrote in my earlier (and subsequent
	emails), I will be presenting a possible model and the supporting technology 
	around it. This model is one of two which has been proposed by the DM-catalog 
	group, but doesn't appear to be at odds with the other model (e.g. the other may
	be realized with our model, and viceversa). However, as Pedro points out, no merger 
	of ideas has yet happened so who knows what the final composition will be. 
	Nevertheless, I doubt that we will be able to address most of these 'structural'
	issues in that meeting, and I would still like to inform the wider VO community of 
	the work we have been doing.
	
	So, hopefully not to be too repetitive, my  concern in modeling catalogs has been 
	that we create an adequate structure to allow the needed, sophisticated, queries 
	that the VO applications will demand. As this need overlaps with the VOQL community, 
	I would think you all would be somewhat interested in this topic :)

	Hence, I am (still) interested in presenting details of what needs to be done
	in order to create "queriable" catalogs that meet a number of VO requirements and point
	to possible technologies that I and Ed have been researching which meet this need.
	If this approach is improper (presenting this work at this point) then I am happy to 
	withdraw my talk so that things proceed more smoothly between myself and all other
	VO groups (!!). 

	Regards, (and hopefully last email on this subject by me! Please Maria and Pedro come
	to a decision on what the right approach should be and I will follow it)

	=brian

-- 
--------------------------------------
|                                     
| Dr. Brian Thomas                    
|                                     
| Dept of Astronomy                   
| University of Maryland-College Park 
|
| Phone: (301) 405-2312               
| Fax: (301) 314-9067                 
|                                     
--------------------------------------

From owner-dm-catalog@eso.org  Thu Sep 22 22:10:15 2005
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From: Brian Thomas <thomas@astro.umd.edu>
Organization: University of Maryland
To: voql@ivoa.net
Subject: Re: VOCatalog presentation desired? (Was: Re: Prospective =?utf-8?q?agenda=09for_VOQL_session_in?= Madrid
Date: Thu, 22 Sep 2005 10:34:16 -0400
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	Pedro, All,

	Perhaps there is some confusion here. First and formost, I agree with 
	Pedro that I am not presenting any official Catalog model to the VO.

	What *I am presenting* is a possible model which answers a number
	of needs for VO query, in particular, VOQL (as defined as the query
	language that happens after ADQL). I was not presuming to detail
	the composition of the 'source' or any other astro object we may catalog, 
	but I do presume to detail some structural issues with creating a 
	queriable catalog (which is, of course, of paramount importance to 
	catalogs). Therefore, when I saw a call for some information about
	querying catalogs, I spoke up for giving a short presentation on my 
	ideas on this matter.

	I hope this clears the air.

	=b.t.

On Thursday 22 September 2005 04:13 am, Pedro Osuna wrote:
> Dear all,
> 
> I appreciate the effort that Brian is doing in defining his catalogue
> data model, but there has not been any consensus yet on the type of
> Catalogue data model that the IVOA will endorse.
> 
> As some of you -including Brian- know (from the Catalogue Data Model
> mail list) I have called for a meeting on this issue before the interop
> (in particular on monday the 5th in the afternoon)  to clarify precisely
> many of these issues. After that meeting, I planned to have small
> meetings to the chairmans of those groups with which the Catalogue DM
> might have a relation (in particular, and as reported in Kyoto, with the
> SkyNode - one of the hypothetical Catalogue DM consumers).
> 
> Therefore, you can allocate time if you want to Brian, but not to report
> on the IVOA Catalogue Data Model, which I will do in the Data Model
> session as per Jonathan's agenda.
> 
> I will be happy to re-report at the VOQL session should you consider it
> necessary.
> 
> Cheers,
> P.
> 
> 
> 
> 
> On Wed, 2005-09-21 at 14:45, Brian Thomas wrote:
> > On Wednesday 21 September 2005 03:43, Maria A. Nieto-Santisteban wrote:
> > >         * Table data model (standard column names) Where does the Catalog
> > > Data Model WG stand?
> > > 
> > 
> > 	Hi,
> > 
> > 	I am not sure that I can speak for the Catalog working group, but I can
> > 	present a VO Catalog model which has been proposed and is not (apparently)
> > 	at odds with the other models presented by the WG. 
> > 
> > 	This catalog model is built for the purposes of being queried,
> > 	holding a wide selection of the data which are present in the VO, is developed 
> > 	so that it can overlay a series of SQL tables/databases (e.g. SkyNodes 
> > 	accessed by ADQL), and can eventually be used in conjunction
> > 	with an advanced form of UCD..."UCD3". 
> > 
> > 	The query mechanism for this catalog is made in terms of "XQuery+" (an 
> > 	extended form of the standard XQuery). I can try to fit this all in to 10 min 
> > 	presentation. 
> > 
> > 	Some materials (all which is older, and not terribly organized at the moment,
> > 	and which I am in the process of updating) for this model may be found at :
> > 
> > 	http://archive.astro.umd.edu/VOCatalog
> > 
> > 	and 
> > 
> > 	http://archive.astro.umd.edu/NX_api/index.html
> > 
> > 	I shall also be presenting a poster on this work at the ADASS meeting which
> > 	proceeds the IVOA.
> > 
> > 	Thanks,
> > 
> > 	=brian

-- 
--------------------------------------
|                                     
| Dr. Brian Thomas                    
|                                     
| Dept of Astronomy                   
| University of Maryland-College Park 
|
| Phone: (301) 405-2312               
| Fax: (301) 314-9067                 
|                                     
--------------------------------------

From owner-dm-catalog@eso.org  Fri Sep 23 01:15:45 2005
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From: "Maria A. Nieto-Santisteban" <nieto@skysrv.pha.jhu.edu>
To: voql@ivoa.net
cc: dm-catalog@ivoa.net
Subject: Brian's VOCatalog presentation
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Hi,

I understand Brian is not presenting the official Catalog DM WG view. I
think his experience will be good to know by the VOQL WG.

> On Thu, 22 Sep 2005, Brian Thomas wrote:  

> Please Maria and Pedro come to a decision on what the right approach
> should be and I will follow it)



> On Thursday 22 September 2005 04:13 am, Pedro Osuna wrote:

> >... After that meeting, I planned to have small
> > meetings to the chairmans of those groups with which the Catalogue DM

perfectly sufficient. And in any case, we'll do our best to attend your
CAT-DM report during the DM session.

Cheers,

Maria
-----------------------------------------------------------------------
Maria A. Nieto-Santisteban (nieto@pha.jhu.edu)
Johns Hopkins University
3400 N. Charles St.
Physics & Astronomy Department
Baltimore, MD 21218 (USA)

Tel: 	1 410 516-7679  Fax: 	1 410 516-5096

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From: Matteo Guainazzi <Matteo.Guainazzi@sciops.esa.int>
Subject: Re: Source Catalogue DM
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
  <title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
<font size="+1">Dear Anita,<br>
<br>
&nbsp;many thanks for your comments on the Source Catalogue DM. Most of them
are being taken into account in the ongoing production of the first
document draft. I detail hereby a few exceptions - as well as some more
qualitative additional comments:<br>
</font>
<ol>
  <li>the "Source Catalogue DM" aims indeed at being - as you wish -
"source-centered". Its overall rationale is to isolate elements which
belong to, e.g., external models such as "Observations" or "SED", and
put link to the relevant models. Hence, I have moved "snr" and
"detectionProbability" to "SED" and "Observations", respectively, as
you suggest. I am open and keen to do the same if further "duplicated
items" are spotted<br>
  </li>
  <li>the "AGN" box is indeed a "Classification"-type box, and will be
renamed accordingly. As such, it is intended to be neatly separated
from the "Morphology" box, which should contain only purely
observational properties, as you suggested</li>
  <li>although a simple logical flag to highlight orbiting objects is
surely a possible solution, I am not sure I understand why the "Orbit"
element should make any harm. I have left it as it was in the original
scheme, waiting for more discussion on this point. <br>
  </li>
  <li>I am not sure I understand your suggestion to substitute
"varAmplitude" with "d(flux)/d(time)". "d(flux)" <b>is</b>
"varAmplitude", if I understand correctly what you mean. On the other
hand, "d(time)" can be often misleading, as it may be related to the
observation sampling rather then to the intrinsic variability timescale
of the source. I have left it as it was in the original scheme, waiting
for more discussion on this point. I have left as well "varPeriod" and
"varType", which look to me unambiguous, and therefore worth being
included in the model<br>
  </li>
  <li>it goes without saying that many - if not most - of the
quantities in the model are wavelength-dependent. We have
"Source.frequency", in facts</li>
  <li>is "limiting noise" the same as "localBackgroundNoise"? I guess
so. In this case, I believe that it is more appropriate to leave it in
the "Observation" box</li>
</ol>
&nbsp;<big>Regards, Matteo</big><br>
<pre class="moz-signature" cols="72">-- 
Matteo Guainazzi
XMM-Newton SOC				<a class="moz-txt-link-abbreviated" href="mailto:Matteo.Guainazzi@sciops.esa.int">Matteo.Guainazzi@sciops.esa.int</a>
European Space Astronomy Centre	of ESA	Phone:     +34 91 8131 176
VILSPA, Apartado 50727, E-28080 Madrid 	Fax:       +34 91 8131 172         
</pre>
</body>
</html>

From owner-dm-catalog@eso.org  Thu Sep 29 11:58:02 2005
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From: Anita Richards <amsr@jb.man.ac.uk>
To: dm-catalog@ivoa.net
Subject: Re: Source Catalogue DM 
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Dear all,

Matteo - thanks for clarifications and comments (Date: 
2005-09-26Z08:38:39)

A brief response:
I agree entirely with most of your points which you ahve put better than I 
did.  However

> 3. although a simple logical flag to highlight orbiting objects is 
>    surely a possible solution, I am not sure I understand why the 
>    "Orbit" element should make any harm. I have left it as it was in the 
>    original scheme, waiting for more discussion on this point.

I don;t object strongly, I suggested simplifying it for two reasons, 
firstly on principle, and secondly that the presnt model seems to be too 
detailed for my simplistic version but not detailed enough for 
re-observation (e.g. it does not seem to include the time/place origin on 
the orbit..).

Similarly on your point 4. about variable flux.
"varPeriod" is fine for analysts, but observers need to know the zero time 
of the period.

In fact, from a purely observational point of view, it can be difficult to 
disentangle the sort of variability e.g. caused by the pulsation of a 
solitary star, from an eclipsing and/or eruptive binary.  It might be 
helpful to look at the definitions of the various IRAS and Hipparcos 
flags, which was a very simple way (before XML was invented!) of 
attempting unbiased observational classification - although even they got 
some things wrong, e.g. Hipparcos assumed that all stars were unresolved 
and so categorised some solitary red supergiants as multiple.

> 5. it goes without saying that many - if not most - of the quantities in 
>    the model are wavelength-dependent. We have "Source.frequency", in 
>    facts

Hmm, so is each property of a source related to s specific frequency?  I 
think that this would be clearer to me if I were to see it applied to some 
example sources.  We could take some objects from NED or SIMBAD and see if 
we can model them - e.g. Markarian 273 (galaxy) or HM Sge (symbiotic 
binary star) - and move on to more difficult cases like star-forming 
regions or clusters of galaxies.  I'd be happy to help, maybe we can 
discuss this in Madrid - I haven't time to do much before then, sorry.

As a more general point and partly in reply to Jesus, 
(Date: 2005-09-15Z16:19:4)

I think that if we do the above it will be obvious that we have to be very 
selective in what properties we explicitly include, otherwise the model 
will become so complex that no-one will fill it in. It should be possible 
to opulate the model by some kind of supervised automatic harvesting.  It 
is not supposed to reproduce all the information in every catalogue. 
That is why I feel that terms like Albedo are far too specific.  We stray 
into the area covered by ucd's...

> However, it does not solve the question of what do you need to describe 
> a Source (it only leaves a placeholder to add all the properties that 
> the source could have, but without trying to define them). I think we 
> need something more detailed if we want to use this data model as a base 
> to inter-operate in the future.

We need some use cases, the presentation mentioned at 
http://www.ivoa.net/internal/IVOA/IVAODMCatalogsWP/Poona_2004_Catalogue_DM.pdf 
has Mireille's suggestion "Is the source in this catalogue the same as the 
one in this other catalogue" which is not nearly as simple as it might 
sound in the case of e.g. a gamma ray burst with a poor position - in 
which case you have to identify which of maybe 10 objects in its error box 
is a likely host - or a galaxy with radio jet hotspots many arcmin from 
the optical centre...

But maybe we should start with simpler cases, e.g. as in Berndt Vollmer's 
SpecFind.  Mireille's question has the very practical corollary, of 
helping when you want to observe a source e.g. in the radio, when you only 
ahve X-ray and optical properties known, etc.

I like the model presented at p. 5 of the Poona_2004_Catalogue_DM.pdf - I 
don;t think that we want to get much more complex.  However, thre should 
be a link to the Observation DM - as I understand it, the object labled 
Observation on p. 5 is specifically for VOEvent use, as it omites some 
rather vital information for most people like Frequency.

thanks
a

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
Dr. Anita M. S. Richards, AstroGrid Astronomer
MERLIN/VLBI National Facility, University of Manchester, 
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K. 
tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).

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Date: Thu, 29 Sep 2005 13:46:11 +0200
From: Pedro Osuna <Pedro.Osuna@sciops.esa.int>
Subject: Re: Source Catalogue DM
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Dear Anita,

I have refrained from answering on specific issues as to whether the
Source Data Model is too complex etc. because that will be treated at
the meeting I proposed for monday. In this meeting I pretend to show you
all how we are trying to specify the difference between a Catalogue Data
Model, a Catalogue of Sources described by a Source Data Model and a
simple Table.

I think there is some confusion within the group on what these things
mean, and I'm a bit surprised that this comes out so late; but on monday
will try to come to common agreements on this.

On the presentation in Poona, there is a more recent one from Kyoto that
I have uploaded to:
http://www.ivoa.net/twiki/bin/view/IVOA/IVAODMCatalogsWP
(which was in the Kyoto meeting pages).

In it, you can see clearer links to Observations, etc., but as I say, I
will be precisely trying to explain all this on monday....

See you then here on monday (the 3rd, by the way, not the 5th as I said
in my original mail)


Cheers,
P.




On Thu, 2005-09-29 at 11:57, Anita Richards wrote:
> Dear all,
> 
> Matteo - thanks for clarifications and comments (Date: 
> 2005-09-26Z08:38:39)
> 
> A brief response:
> I agree entirely with most of your points which you ahve put better than I 
> did.  However
> 
> > 3. although a simple logical flag to highlight orbiting objects is 
> >    surely a possible solution, I am not sure I understand why the 
> >    "Orbit" element should make any harm. I have left it as it was in the 
> >    original scheme, waiting for more discussion on this point.
> 
> I don;t object strongly, I suggested simplifying it for two reasons, 
> firstly on principle, and secondly that the presnt model seems to be too 
> detailed for my simplistic version but not detailed enough for 
> re-observation (e.g. it does not seem to include the time/place origin on 
> the orbit..).
> 
> Similarly on your point 4. about variable flux.
> "varPeriod" is fine for analysts, but observers need to know the zero time 
> of the period.
> 
> In fact, from a purely observational point of view, it can be difficult to 
> disentangle the sort of variability e.g. caused by the pulsation of a 
> solitary star, from an eclipsing and/or eruptive binary.  It might be 
> helpful to look at the definitions of the various IRAS and Hipparcos 
> flags, which was a very simple way (before XML was invented!) of 
> attempting unbiased observational classification - although even they got 
> some things wrong, e.g. Hipparcos assumed that all stars were unresolved 
> and so categorised some solitary red supergiants as multiple.
> 
> > 5. it goes without saying that many - if not most - of the quantities in 
> >    the model are wavelength-dependent. We have "Source.frequency", in 
> >    facts
> 
> Hmm, so is each property of a source related to s specific frequency?  I 
> think that this would be clearer to me if I were to see it applied to some 
> example sources.  We could take some objects from NED or SIMBAD and see if 
> we can model them - e.g. Markarian 273 (galaxy) or HM Sge (symbiotic 
> binary star) - and move on to more difficult cases like star-forming 
> regions or clusters of galaxies.  I'd be happy to help, maybe we can 
> discuss this in Madrid - I haven't time to do much before then, sorry.
> 
> As a more general point and partly in reply to Jesus, 
> (Date: 2005-09-15Z16:19:4)
> 
> I think that if we do the above it will be obvious that we have to be very 
> selective in what properties we explicitly include, otherwise the model 
> will become so complex that no-one will fill it in. It should be possible 
> to opulate the model by some kind of supervised automatic harvesting.  It 
> is not supposed to reproduce all the information in every catalogue. 
> That is why I feel that terms like Albedo are far too specific.  We stray 
> into the area covered by ucd's...
> 
> > However, it does not solve the question of what do you need to describe 
> > a Source (it only leaves a placeholder to add all the properties that 
> > the source could have, but without trying to define them). I think we 
> > need something more detailed if we want to use this data model as a base 
> > to inter-operate in the future.
> 
> We need some use cases, the presentation mentioned at 
> http://www.ivoa.net/internal/IVOA/IVAODMCatalogsWP/Poona_2004_Catalogue_DM.pdf
> has Mireille's suggestion "Is the source in this catalogue the same as the 
> one in this other catalogue" which is not nearly as simple as it might 
> sound in the case of e.g. a gamma ray burst with a poor position - in 
> which case you have to identify which of maybe 10 objects in its error box 
> is a likely host - or a galaxy with radio jet hotspots many arcmin from 
> the optical centre...
> 
> But maybe we should start with simpler cases, e.g. as in Berndt Vollmer's 
> SpecFind.  Mireille's question has the very practical corollary, of 
> helping when you want to observe a source e.g. in the radio, when you only 
> ahve X-ray and optical properties known, etc.
> 
> I like the model presented at p. 5 of the Poona_2004_Catalogue_DM.pdf - I 
> don;t think that we want to get much more complex.  However, thre should 
> be a link to the Observation DM - as I understand it, the object labled 
> Observation on p. 5 is specifically for VOEvent use, as it omites some 
> rather vital information for most people like Frequency.
> 
> thanks
> a
> 
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
> Dr. Anita M. S. Richards, AstroGrid Astronomer
> MERLIN/VLBI National Facility, University of Manchester, 
> Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K. 
> tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).
-- 
Pedro Osuna Alcalaya

ESA 
Science Archives System Engineer
Science Archive Team
European Space Astronomy Centre
(ESAC/ESA)
e-mail: Pedro.Osuna@esa.int
Tel + 34 91 8131314
---------------------------------                                                                                
European Space Astronomy Centre
European Space Agency
P.O. Box 50727
E-28080 Villafranca del Castillo
MADRID - SPAIN

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Date: Thu, 07 Sep 2006 17:04:56 +0200
From: Pedro Osuna <Pedro.Osuna@sciops.esa.int>
Subject: STC subset for Source Catalogue Data Model
To: Arnold Rots <arots@head.cfa.harvard.edu>
Cc: Pedro Osuna <Pedro.Osuna@sciops.esa.int>, Aurelien.Stebe@sciops.esa.int,
        Inaki.Ortiz@sciops.esa.int, Jesus.Salgado@sciops.esa.int, dm@ivoa.net,
        dm-catalog@ivoa.net
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Reply-To: Pedro Osuna <Pedro.Osuna@sciops.esa.int>

Dear Arnold,

in the context of the Source Catalogue Data Model, we are trying to make
use of the STC to model the part of the Source DM related to the
position of the source.

We are accessing Source Data Model-aware ADQL servers that we have
installed over some of the ESA projects (XMM-Newton, ISO) and some
CDS Vizier ones (Tycho2, USNOB1, Denis).

In some of these catalogues, we do have entries in, e.g., equatorial
J2000 coordinates and galactic ones. To make the correspondence between
them and the STC, we would need unique (i.e., biunivocal) UTYPEs to
describe the positional STC elements corresponding to each particular
coordinate type.

We have tried to build such a utype from the current STC structure, but
have not succeeded so far.

Could you please give us some advice on how to do it?

Wait for your news.

Thanks.

Cheers,
P.
-- 
Pedro Osuna Alcalaya

European Space Agency (ESA)
European Space Astronomy Centre (ESAC)
Research and Scientific Support Department (RSSD)
Astronomy Science Operations Division (SCI-SD)
e-mail: Pedro.Osuna@esa.int
Tel + 34 91 813 13 14    Fax: +34 91 813 11 72
-------------------------------------------------                                                                                
European Space Astronomy Centre (ESAC)
P.O. Box 50727
E-28080 Villafranca del Castillo
MADRID - SPAIN

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Date: Thu, 07 Sep 2006 17:04:56 +0200
From: Pedro Osuna <Pedro.Osuna@sciops.esa.int>
Subject: STC subset for Source Catalogue Data Model
To: Arnold Rots <arots@head.cfa.harvard.edu>
Cc: Pedro Osuna <Pedro.Osuna@sciops.esa.int>, Aurelien.Stebe@sciops.esa.int,
        Inaki.Ortiz@sciops.esa.int, Jesus.Salgado@sciops.esa.int, dm@ivoa.net,
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Reply-To: Pedro Osuna <Pedro.Osuna@sciops.esa.int>

Dear Arnold,

in the context of the Source Catalogue Data Model, we are trying to make
use of the STC to model the part of the Source DM related to the
position of the source.

We are accessing Source Data Model-aware ADQL servers that we have
installed over some of the ESA projects (XMM-Newton, ISO) and some
CDS Vizier ones (Tycho2, USNOB1, Denis).

In some of these catalogues, we do have entries in, e.g., equatorial
J2000 coordinates and galactic ones. To make the correspondence between
them and the STC, we would need unique (i.e., biunivocal) UTYPEs to
describe the positional STC elements corresponding to each particular
coordinate type.

We have tried to build such a utype from the current STC structure, but
have not succeeded so far.

Could you please give us some advice on how to do it?

Wait for your news.

Thanks.

Cheers,
P.
-- 
Pedro Osuna Alcalaya

European Space Agency (ESA)
European Space Astronomy Centre (ESAC)
Research and Scientific Support Department (RSSD)
Astronomy Science Operations Division (SCI-SD)
e-mail: Pedro.Osuna@esa.int
Tel + 34 91 813 13 14    Fax: +34 91 813 11 72
-------------------------------------------------                                                                                
European Space Astronomy Centre (ESAC)
P.O. Box 50727
E-28080 Villafranca del Castillo
MADRID - SPAIN

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Date: Tue, 26 Sep 2006 11:53:56 +0200
From: Jean-Christophe malapert <jmalaper@eso.org>
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Dear all,

I would like to use the Source DM in oder to store object coordinates 
and magnitudes. However I don't see the Coordinate system used 
(ICRS,FK5,FK4). Basically, with FK5,Fk4 you need respectively to define 
the equinox and the epoch. Would it be possible to add these parameters 
in the DM ?

Cheers,
J-Christophe

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title:Scientific Software Engineer
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--------------010302080001060307050704--

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Date: Tue, 26 Sep 2006 15:25:47 +0200
From: =?ISO-8859-1?Q?I=F1aki_Ortiz_de_Landaluce?= <Inaki.Ortiz@sciops.esa.int>
Subject: Re: Coordinate System in DM
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To: Jean-Christophe malapert <jmalaper@eso.org>
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Dear Jean-Christophe

Last week we presented at the IVOA Interoperability meeting held in 
Moscow an updated version of the Source Catalog Data Model. You can have 
a look at what we have presented so far here
   http://www.ivoa.net/internal/IVOA/IvoaDataModel/SourceDM_Moscow_2006.pdf
The model is going to be released formally as a new IVOA Working Draft 
shortly.

Among several changes that we have included, there is one that might be 
of your interest or may even solve your request. The 'Source' element 
now points to a 'Coordinates' container , where the equinox, the 2D 
coordinate values and their respective errors can be specified as 
attributes. As we try to keep the model as simple as possible and still 
consistent with the rest of the data models we take the same assumptions 
as the STC and the Coordinate Data Model do about coordinate frames, 
equinox and epoch:

"[... ] the token identifying the coordinate system and frame. The usual 
value is ICRS, which is the standard post-Hipparcos-era RA and Dec with 
an equinox consistent with J2000. The other systems have different 
orientation and rotation:
   - FK4 and FK5 have a pole whose position depends on time with respect 
to the ICRS system. This pole also depends on a parameter called the 
equinox; *by convention FK4 and FK5 use Besselian and Julian epochs 
(defaults B1950.0 and J2000.0) respectively to label the equinox*. [....]"
(Excerpt from Coordinates Data model, IVOA DM WG Internal Note)

Therefore we have included the equinox attribute only, assuming that the 
default epochs would label the equinox for FK4 and FK5. We decided to 
consider the epoch implicitly in the equinox so to start with a simple 
model. Anyway, if you find it useful, the 'Coordinates' class could be 
easily extended to include the 'reference frame' and 'epoch' attributes 
too, where the reference frame would be required (with same set of 
allowed values as STC and Coordinates Data Model describes) and the 
epoch optional.

Should you have any other question please let us know.

Cheers,

Inaki Ortiz

Jean-Christophe malapert wrote:
> Dear all,
>
> I would like to use the Source DM in oder to store object coordinates 
> and magnitudes. However I don't see the Coordinate system used 
> (ICRS,FK5,FK4). Basically, with FK5,Fk4 you need respectively to 
> define the equinox and the epoch. Would it be possible to add these 
> parameters in the DM ?
>
> Cheers,
> J-Christophe

From owner-dm-catalog@eso.org  Tue Sep 26 16:47:15 2006
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From: Brian Thomas <thomas@astro.umd.edu>
Organization: University of Maryland
To: dm-catalog@ivoa.net, dm@ivoa.net
Subject: Re: Coordinate System in DM
Date: Tue, 26 Sep 2006 10:50:10 -0400
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Reply-To: Brian Thomas <thomas@astro.umd.edu>

On Tuesday 26 September 2006 05:53, Jean-Christophe malapert wrote:
> Dear all,
> 
> I would like to use the Source DM in oder to store object coordinates 
> and magnitudes. However I don't see the Coordinate system used 
> (ICRS,FK5,FK4). Basically, with FK5,Fk4 you need respectively to define 
> the equinox and the epoch. Would it be possible to add these parameters 
> in the DM ?

	Ah, I haven't seen the latest document (where is it posted) but 
	it sounds like the source DM just inherit in the relevant parts of
	the STC to handle this.

	=brian

> 
> Cheers,
> J-Christophe
> 

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From: Brian Thomas <thomas@astro.umd.edu>
Organization: University of Maryland
To: dm-catalog@ivoa.net, dm@ivoa.net
Subject: Re: Coordinate System in DM
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Reply-To: Brian Thomas <thomas@astro.umd.edu>

On Tuesday 26 September 2006 05:53, Jean-Christophe malapert wrote:
> Dear all,
> 
> I would like to use the Source DM in oder to store object coordinates 
> and magnitudes. However I don't see the Coordinate system used 
> (ICRS,FK5,FK4). Basically, with FK5,Fk4 you need respectively to define 
> the equinox and the epoch. Would it be possible to add these parameters 
> in the DM ?

	Ah, I haven't seen the latest document (where is it posted) but 
	it sounds like the source DM just inherit in the relevant parts of
	the STC to handle this.

	=brian

> 
> Cheers,
> J-Christophe
> 

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From: Kirk D Borne <kborne@gmu.edu>
Subject: FWD: Practical Semantic Astronomy 09 -- FINAL CALL FOR PARTICIPATION
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**Apologies for duplicate copies**


Practical Semantic Astronomy 09 -- FINAL CALL FOR PARTICIPATION

2-5 March 2009

Glasgow, UK

http://www.dcs.gla.ac.uk/workshops/semast09/



It's now just a little under a month to the second Practical Semantic  
Astronomy workshop.  The programme is online at <http://www.dcs.gla.ac.uk/workshops/semast09/programme.shtml 
 >, and it promises to be an interesting and hugely valuable workshop,  
with lots of cross-fertilisation between the broad range of  
participants.

The workshop should be of interest to people working in semantic  
technologies generally, as well as science data specialists, as we'll  
be examining challenging concrete use-cases, covering discipline- 
specific linked open data, reasoning about data, and semantic search.

Plus, Glasgow's a great city!

We look forward to seeing you in March.






Semantic astronomy promises to expand the scientific discovery  
potential of exponentially growing data collections by enabling  
natural language querying, content-based searching, rich metadata  
markup and retrieval, rapid integration of diverse data collections,  
and machine-assisted scientific discovery.

Practical Semantic Astronomy 2009 is the second in a series of  
workshops first held at Caltech in February 2008. The workshop brings  
together experts from a broad range of disciplines using semantic  
technologies, alongside practitioners experimenting with these  
techniques to address current problems in astroinformatics.

The Virtual Observatory is a loose planet-wide collaboration of  
astronomy computing projects, aiming to make available the high-volume  
and rich data of astronomy. Although astronomical data is generally  
well-described, it is very dispersed, so that there is a substantial  
data-discovery and integration problem, making it fertile ground for  
the sorts of semantic approaches applied with such success in other  
disciplines.

In SemAst 2009, we will pair keynote speakers and astronomical use- 
cases, focusing broad expertise on challenging and exciting problems  
in astroinformatics. The keynotes speakers will be:

  * Danny Ayers, Talis, UK
  * Peter Fox, National Center for Atmospheric Research, USA
  * Antoine Isaac, Vrije Universiteit Amsterdam, The Netherlands
  * Amedeo Napoli, LORIA, France
  * Joel Sachs, University of Maryland, Baltimore County, USA
  * Robert Stevens, University of Manchester, UK

Topics of Interest

  * Astronomy and solar ontologies
  * Knowledgebases
  * Metadata for astronomical databases
  * Semantic integration
  * Semantic queries and data mining
  * Semantic technologies

--Boundary_(ID_n4GHKx5Api8Lr13oZ5SHOw)
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adr:;;4400 University Drive, MS 6A2;Fairfax;VA;22030;USA
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**Apologies for duplicate copies**


Practical Semantic Astronomy 09 -- FINAL CALL FOR PARTICIPATION

2-5 March 2009

Glasgow, UK

http://www.dcs.gla.ac.uk/workshops/semast09/



It's now just a little under a month to the second Practical Semantic  
Astronomy workshop.  The programme is online at <http://www.dcs.gla.ac.uk/workshops/semast09/programme.shtml 
 >, and it promises to be an interesting and hugely valuable workshop,  
with lots of cross-fertilisation between the broad range of  
participants.

The workshop should be of interest to people working in semantic  
technologies generally, as well as science data specialists, as we'll  
be examining challenging concrete use-cases, covering discipline- 
specific linked open data, reasoning about data, and semantic search.

Plus, Glasgow's a great city!

We look forward to seeing you in March.






Semantic astronomy promises to expand the scientific discovery  
potential of exponentially growing data collections by enabling  
natural language querying, content-based searching, rich metadata  
markup and retrieval, rapid integration of diverse data collections,  
and machine-assisted scientific discovery.

Practical Semantic Astronomy 2009 is the second in a series of  
workshops first held at Caltech in February 2008. The workshop brings  
together experts from a broad range of disciplines using semantic  
technologies, alongside practitioners experimenting with these  
techniques to address current problems in astroinformatics.

The Virtual Observatory is a loose planet-wide collaboration of  
astronomy computing projects, aiming to make available the high-volume  
and rich data of astronomy. Although astronomical data is generally  
well-described, it is very dispersed, so that there is a substantial  
data-discovery and integration problem, making it fertile ground for  
the sorts of semantic approaches applied with such success in other  
disciplines.

In SemAst 2009, we will pair keynote speakers and astronomical use- 
cases, focusing broad expertise on challenging and exciting problems  
in astroinformatics. The keynotes speakers will be:

  * Danny Ayers, Talis, UK
  * Peter Fox, National Center for Atmospheric Research, USA
  * Antoine Isaac, Vrije Universiteit Amsterdam, The Netherlands
  * Amedeo Napoli, LORIA, France
  * Joel Sachs, University of Maryland, Baltimore County, USA
  * Robert Stevens, University of Manchester, UK

Topics of Interest

  * Astronomy and solar ontologies
  * Knowledgebases
  * Metadata for astronomical databases
  * Semantic integration
  * Semantic queries and data mining
  * Semantic technologies

--Boundary_(ID_n4GHKx5Api8Lr13oZ5SHOw)
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adr:;;4400 University Drive, MS 6A2;Fairfax;VA;22030;USA
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Subject: FWD: Practical Semantic Astronomy 09 -- FINAL CALL FOR PARTICIPATION
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**Apologies for duplicate copies**


Practical Semantic Astronomy 09 -- FINAL CALL FOR PARTICIPATION

2-5 March 2009

Glasgow, UK

http://www.dcs.gla.ac.uk/workshops/semast09/



It's now just a little under a month to the second Practical Semantic  
Astronomy workshop.  The programme is online at <http://www.dcs.gla.ac.uk/workshops/semast09/programme.shtml 
 >, and it promises to be an interesting and hugely valuable workshop,  
with lots of cross-fertilisation between the broad range of  
participants.

The workshop should be of interest to people working in semantic  
technologies generally, as well as science data specialists, as we'll  
be examining challenging concrete use-cases, covering discipline- 
specific linked open data, reasoning about data, and semantic search.

Plus, Glasgow's a great city!

We look forward to seeing you in March.






Semantic astronomy promises to expand the scientific discovery  
potential of exponentially growing data collections by enabling  
natural language querying, content-based searching, rich metadata  
markup and retrieval, rapid integration of diverse data collections,  
and machine-assisted scientific discovery.

Practical Semantic Astronomy 2009 is the second in a series of  
workshops first held at Caltech in February 2008. The workshop brings  
together experts from a broad range of disciplines using semantic  
technologies, alongside practitioners experimenting with these  
techniques to address current problems in astroinformatics.

The Virtual Observatory is a loose planet-wide collaboration of  
astronomy computing projects, aiming to make available the high-volume  
and rich data of astronomy. Although astronomical data is generally  
well-described, it is very dispersed, so that there is a substantial  
data-discovery and integration problem, making it fertile ground for  
the sorts of semantic approaches applied with such success in other  
disciplines.

In SemAst 2009, we will pair keynote speakers and astronomical use- 
cases, focusing broad expertise on challenging and exciting problems  
in astroinformatics. The keynotes speakers will be:

  * Danny Ayers, Talis, UK
  * Peter Fox, National Center for Atmospheric Research, USA
  * Antoine Isaac, Vrije Universiteit Amsterdam, The Netherlands
  * Amedeo Napoli, LORIA, France
  * Joel Sachs, University of Maryland, Baltimore County, USA
  * Robert Stevens, University of Manchester, UK

Topics of Interest

  * Astronomy and solar ontologies
  * Knowledgebases
  * Metadata for astronomical databases
  * Semantic integration
  * Semantic queries and data mining
  * Semantic technologies

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org:George Mason University;Dept of Computational and Data Sciences
adr:;;4400 University Drive, MS 6A2;Fairfax;VA;22030;USA
version:2.1
email;internet:kborne@gmu.edu
title:Associate Professor
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From dm-catalog-bounces@ivoa.net  Mon May 25 15:07:16 2009
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Date: Mon, 25 May 2009 15:07:00 +0200
From: Andreas Wicenec <awicenec@eso.org>
Organization: ESO
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Hi,

I would like to draw your attention to an implementation of a fairly complex 
catalogue data model for ALMA. The intention of this particular model is to 
cover the needs of ALMA in terms of dynamic source (calibration and science) and 
spectral line catalogues. Dynamic here means that newly extracted parameters 
will be added as observatories are executing new observations. The current 
implementation supports multiple observations from multiple observatories, with 
multiple names, coordinates, fluxes and velocities. That means that each 
observation can carry its own set of parameters (for coordinates even its own 
coordinate system). The whole model is implemented in Python using an 
object-relational mapper called SQLAlchemy. The logic allows to combine 
observational parameters into statistical parameters like mean fluxes or mean 
positions and velocities. If there is enough interest I may describe/discuss 
this in more detail during our meeting here in Strasbourg (but I'm here only 
until Wednesday afternoon).

Cheers,
Andreas

--------------060903000604090509000705
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From: Rick Wagner <rwagner@physics.ucsd.edu>
Subject: Re: ALMA catalogue data model
Date: Fri, 5 Jun 2009 21:48:52 -0700
To: Andreas Wicenec <awicenec@eso.org>
Cc: dm-catalog@ivoa.net
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Hi Andreas,

Is there a web page somewhere describing this, or that provides  
access to the source code?

Thanks,
Rick

On May 25, 2009, at 6:07 AM, Andreas Wicenec wrote:

> Hi,
>
> I would like to draw your attention to an implementation of a  
> fairly complex catalogue data model for ALMA. The intention of this  
> particular model is to cover the needs of ALMA in terms of dynamic  
> source (calibration and science) and spectral line catalogues.  
> Dynamic here means that newly extracted parameters will be added as  
> observatories are executing new observations. The current  
> implementation supports multiple observations from multiple  
> observatories, with multiple names, coordinates, fluxes and  
> velocities. That means that each observation can carry its own set  
> of parameters (for coordinates even its own coordinate system). The  
> whole model is implemented in Python using an object-relational  
> mapper called SQLAlchemy. The logic allows to combine observational  
> parameters into statistical parameters like mean fluxes or mean  
> positions and velocities. If there is enough interest I may  
> describe/discuss this in more detail during our meeting here in  
> Strasbourg (but I'm here only until Wednesday afternoon).
>
> Cheers,
> Andreas<awicenec.vcf>

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Dear Subscribers:

After consultation with Gretchen & Jesus, this inactive IVOA mailing 
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Please write to ivoadoc@ivoa.net with any questions.

Sincerely,

Sarah Emery Bunn
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