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How to dissolve multiple polygons in unioncascaded?
UnionCascaded requires MultiPolygon as a geometry type, which is why I implemented the option to re-create single polyons. You could also use ogr2ogr from the command line with option -explodecollections:
Is there any way to dissolve overlapping polygons?
Is there any way to dissolve (merge) overlapping polygons, using any GDAL/OGR API or command line tool, while keeping the resulting non overlapping areas distinct? I have searched a lot and I cannot find anything resembling what need.
Are there polygons that are not distinguishable by attributes?
This layer contains polygons which are not distinguishable by attributes. (All have the same attributes). Many of them are overlapping and I would like to get the union of those who are overlapping. Areas that are not connected should result in separate polygons. It is the last point which is causing troubles.
How to Union two geometries in Python OSGeo?
Python osgeo inlcudes a UnionCascaded method that implements the underlying GEOS CascadedUnion method. It is a little strange in that while Union takes two geometries (in form geom1.Union (geom2) ), UnionCascaded operates on a geometry collection.
How to combine irregular shapes with cascaded Union?
My goal is to get something like the picture on the right: where the rest of my code will determine how many points in a random distribution fall within the boundaries of an irregular shape. I’m confused on what the error is referring to when it returns the “null value” comment.
How does Union take two geometries in GEOS?
It is a little strange in that while Union takes two geometries (in form geom1.Union (geom2) ), UnionCascaded operates on a geometry collection. According to GEOS documentation, this method is more efficient than performing a union piecewise on individual geometries.