William Kyngesburye wrote:
I wonder if there is a way for a postgres function to see what the
actual kind of validity error is (it just comes up as a NOTICE: in the
sql output)?
Yes, very new and still in discussion amongst the development team, but it's possible to do this with the development
branch (svn head) of PostGIS.
postgis=# SELECT ST_IsValidReason(
'POLYGON (( 0 0, 0 4, 4 4, 4 0, 0 0 ),
( 3 5, 2 5, 2 6, 3 6, 3 5 ))'::geometry);
st_isvalidreason
-------------------------------
Hole lies outside shell [3 5]
(1 row)
test=# SELECT ST_IsValidReason(
'POLYGON (( 0 0, 0 4, 4 4, 4 0, 0 0 ),
( 2 2, 2 3, 3 3, 5 2, 2 2 ))'::geometry);
st_isvalidreason
---------------------------
Self-intersection [4 2.5]
(1 row)
Cheers,
Kevin
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