[geos-devel] Unary Union (was: rgeos interface to R classes)

strk strk at keybit.net
Fri Feb 5 03:27:57 EST 2010


On Mon, Feb 01, 2010 at 09:48:57AM -0800, Martin Davis wrote:

> The technique of using buffer(0) to union polygons is now deprecated in 
> favour of using Unary Union (Geometry.union() - not sure what the exact 
> GEOS signature is).  Unary Union is usually faster and more robust than 
> the previous technique.  You might want to check this out.

Uhm, I might have missed this in my last port (either completely
or just the outer interface). Is the JTS repository finally landed
so to take a look ? I'm interested in evaluating its use for "geometry
cleanup" purposes (http://trac.osgeo.org/postgis/ticket/399)

--strk; 

  ()   Free GIS & Flash consultant/developer
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