[postgis-users] illustration for relations

Michael Fuhr mike at fuhr.org
Thu Jul 12 06:57:53 PDT 2007

On Thu, Jul 12, 2007 at 03:07:12PM +0200, Willy-Bas Loos wrote:
> Are there any illustrative drawings available for the (GEOS or not) Geometry
> Relationship/Processing Functions in postgis?

See "OpenGIS Implementation Specification for Geographic information -
Simple feature access - Part 1: Common architecture," in particular
"6.1.15 Relational operators."  I've found the DE-9IM expressions
at least as helpful as the diagrams in understanding the relational


Michael Fuhr

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