[postgis-users] PostGIS analogues to ArcInfo geoprocessing functions

Martin Davis mbdavis at refractions.net
Thu Jan 29 09:14:48 PST 2009

Have you looked at the code?  I rest my case....

Paul Ramsey wrote:
> 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).
> http://grass.itc.it/grass64/manuals/html64_user/v.overlay.html
> P.
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Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022

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