[postgis-users] illustration for relations

Willy-Bas Loos willybas at gmail.com
Thu Jul 12 07:27:33 PDT 2007

that's helpful, thanks.
at least it explains in more detail what the operations (should) do.
But it's no 'easy' set of diagrams for the people that i try to convert from
ArcGIS shapefile queries.
If there isn't such a set available, i might try to make one myself, based
on the documentation you just recommended.
If i do (will take time), i'll post it here.

Willy-Bas Loos

On 7/12/07, Michael Fuhr <mike at fuhr.org> wrote:
> 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
> operators.
> http://www.opengeospatial.org/standards/sfa
> --
> Michael Fuhr
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> postgis-users at postgis.refractions.net
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