Working with the union and polygonize methods in GDAL/OGR, I often end up with self intersecting polygons. The case is one polygon which essentially consists of two polygons:
In the above example, the polygon has two vertices at the intersection point, but whether the lines meet and goes seperate ways at the point or crosses each other, is unknown.
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Are there methods for splitting a self intersecting polygon like above, into two polygons or a multipolygon?
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Alternatively are there any existing algorithms I could implement my self (I would rather not invent another wheel)?
