Boxes and Polygons in ADQL/STC. Questions and recommendation.
jcg at ipac.caltech.edu
Sat Oct 24 12:11:41 PDT 2009
That's all we ever use. If I wanted to have a range of RA, Dec
I would just put that in as a relational constraint on those fields.
Roy Williams wrote:
> Maybe the best is to forget the confusing word BOX and simply not use it.
> Then we have POLYGON, CONE, RECT as the principle concepts. For an
> image specified by corners, it is a 4-POLYGON.
> John Good wrote:
>> Roy -
>>> My point is that I suspect 90% of region queries will, in reality,
>>> be RECT or CONE. We should make sure this works well in the
>>> prototypes, perhaps delay the more complex region implementation
>>> until these two work well?
>> Not true. Cone is probably the most common but the next most common
>> is people trying to get sources that match an image, which is hardly
>> a RECT (and is in fact usually more like a rotated BOX).
>> - John
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