Difference in polygon's between SIA2 and ADQL

[Walter Landry]

Patrick Dowler <pdowler.cadc at gmail.com> wrote:
> I assume "complicates our implementation" means "have to compute the
> winding direction and maybe reverse vertex order"?

The trouble is just that it is different.  I would like to use the
same underlying implementation for TAP and SIA.  Also, the SIA version
makes it impossible to select more than half the sphere.  So a search
doing something like excluding the galactic plane would be impossible.

Cheers,
Walter Landry