On Sep 18, 2009, at 1:43 AM, Hermann Peifer wrote:
Hi,
I see there is a potentially helpful utility for dissolving
geometries at http://trac.osgeo.org/gdal/browser/trunk/gdal/apps/ogrdissolve.cpp
But obviously, there is no related executable in GDAL 1.6.2 or
1.7.0dev. Are there any plans to continue work on ogrdissolve?
Hermann
Hermann,
I didn't have any plans to keep support for that going as a utility,
which is why it hasn't been more widely promoted or why it doesn't
build by default. Its methods are suspect (depend upon GEOS'
buffer(0) segmentation routines), and for geometry that is highly
coincident that you might frequently want to dissolve (think parcel
boundaries), GEOS often degenerates without some serious handholding.
You can also do the same thing as ogrdissolve by loading your data
into postgis and issuing a little SQL and have way more flexibility.
All of these things made me drop the effort.
It exists now as some code examples, and when a developer notices it
isn't really being used, it might (and can) be removed from the
repository.
Howard
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