Difference in polygon's between SIA2 and ADQL

[Alex Szalay]

STC is mathematically correct and tested carefully. If SIA2 disagrees, it is most likely incorrect.

--Alex

-----Original Message-----
From: dal-bounces at ivoa.net [mailto:dal-bounces at ivoa.net] On Behalf Of Walter Landry
Sent: Wednesday, February 10, 2016 3:01 AM
To: dal at ivoa.net
Subject: Difference in polygon's between SIA2 and ADQL

Hello Everyone,

Reading the description of polygons in ADQL, it links to the description in STC.

  http://www.ivoa.net/Documents/cover/STC-20071030.html

That defines a polygon as the points to the left of the edges.  In contrast, in SIA2, a polygon is defined as the region with smaller area.  Was that inconsistency intentional?  It complicates our implementation.

Thanks,
Walter Landry