Geometry column: STGeomFromText and SRID (what is an SRID?)

Question

I\'m playing with the new geography column in SQL Server 2008 and the STGeomFromText function. Here is my code (works with AdventureWorks2008)

DECLARE @regi         


        

Answer 1

SRID = Spatial Reference IDentifier

coordinates must use the same SRID to be comparable. otherwise you'd end up comparing kilometeres and miles. or something similar.