Identifying STC-S footprints in SIA

[Tom Donaldson]

Hi All,

Specifying image footprints using STC-S expressions, like the Chandra example below, has proven useful in a number of circumstances.   

Polygon J2000 40.57783 0.08684 40.57783 0.08048 40.66467 -0.02850 40.67115 -0.02850 40.67116 -0.02850 40.68450 -0.01787 40.68450 -0.01786 40.68450 -0.01151 40.59767 0.09748 40.59118 0.09748 40.59117 0.09747 40.57784 0.08685

I was wondering if there is consensus on what UType/UCD combination should be used for such FIELDs in an SIA result.  As a provider, I'd like to use the latest/best recommendation.  

From the consumer's point of view, does anyone have insight on whether there is perhaps a small array of possibilities I should look for, based on precedent or current provider behavior?

Thanks!
Tom