[gdal-dev] OGR merge polygon capabilities

[Christopher Schmidt]

On Wed, May 07, 2008 at 10:04:55PM -0400, Clay, Bruce wrote:
> Are there any capabilities built into OGR to walk layer and find all
> overlapping polygons and merge them into multiple larger polygons?

I think that the "Dissolve" action from WPServer does this, using OGR:

http://code.google.com/p/webprocessingserver/source/browse/trunk/webprocessingserver/WebProcessingServer/Action/OGRGeos.py#sr_62_67

Essentially: 
 * Add all your geometries to a geometry collection
 * Buffer the geometry collection (using GEOS Buffer op)
 * Loop through the resulting geometry (if it's a collectino or
   multipoly) and split the geoms back up.

-- Chris

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> Bruce
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-- 
Christopher Schmidt
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