aconti at stsci.edu
Sun Sep 17 09:20:16 PDT 2006
On Sep 17, 2006, at 11:58 AM, Roy Williams wrote:
> Alberto Conti wrote:
>> The adoption of a well known ISO standard or specification seems
>> the most appropriate thing to do, instead of coming up with yet
>> another IVOA recommendation that is just a poor compromise.
> (1) I have tried to find existing standards, but ISO seems to have
> nothing. The word "sexagesimal" in Google does not show a
> recommended notation that I could find. Other information is from
> "people like us" (Iraf, Starlink, Vizier, etc) and recommends
> various output formats. In other words, I don't think there is a
> Sexg standard representation.
this is true, but what you could do is look at "time standards" from
ISO (8601? I think) and extend them to IVOA standards.
> (2) The IVOA is a standards organization. Our job is to make
> standards. Obviously, our standards should not be poor.
perhaps poor was a bad choice of words. My concern is that we propose
something disjoint from what the users are using at the moment (see
FITS) and will be using. I do agree that some standardization is
Supporting all these format
Hours, minutes and Seconds
12 22 31.98 29 53 45.55
12h 22m 31.98s 29d 53m 45.55s
12h 22' 31.98" 29d 53' 45.55"
12h 22' 31.98" -29d 53' 45.55"
12h 22' 31".98 -29d 53' 45".55
Hours/Degrees and Minutes (no seconds)
12 22 29 53
12h 22m 29d 53m
12h 22' 29d 53'
12h 22' -29d 53'
like MAST and most archives do is rather impractical.
> (3) I suggest that many formats be "acceptable" to IVOA
> applications with wide inclusivity. If that effort works, perhaps
> we can think of a tighter format that is "recommended".
indeed, you should accept input in various formats, but you must
recommend one from the IVOA.
> (4) Part of the effort here is to allow our customers to put
> multiple things in text boxes. If it parses to 2 floats, we assume
> long/lat in degrees, if it parses to six numbers, it is Sexg, or
> else perhaps it is an object name.
again, perhaps the focus should be to get a clear understanding from
users (archive searches for example?) on the most common format(s)
and then move to the definition of an IVOA standard.
Just my $.02
> California Institute of Technology
> 626 395 3670
Alberto Conti, Ph.D.
Space Telescope Science Institute (STScI)
3700 San Martin Drive, Baltimore MD 21218
Tel: 410-338-4534 Fax: 410-338-1592
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