[postgis-users] ST_Intersects and NOT ST_Disjoint aren't equal?

Martin Davis mbdavis at refractions.net
Thu Mar 26 14:18:24 PDT 2009

Sufficool, Stanley wrote:
> Would it be appropriate to make st_disjoint an SQL function just
> wrapping _NOT_ st_intersects(...) ?
That's certainly how it's implemented in JTS and GEOS.   I think PostGIS 
has some more optimization code wrapped around that - but the same thing 
should be possible at the PostGIS C library level.

Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022

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