[postgis-users] PostGIS analogues to ArcInfo geoprocessing functions

Paul Ramsey pramsey at opengeo.org
Thu Jan 29 08:50:09 PST 2009

On Thu, Jan 29, 2009 at 8:42 AM, Martin Davis <mbdavis at refractions.net> wrote:
> The basic approach to computing polygon overlays has been well-understood
> for a long time (although this does not imply well-documented!).  The
> implementation however is quite tricky, especially if performance and
> robustness is required.  There is a notable lack of open-source existing
> implementations - which should be an indication of just how difficult this
> really is.

I believe the vector component of GRASS includes overlay (and of
course the raster component does too).



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