As discussed in this question intersecting two GEOS line geometries gives a result which has also been noded. This is very nice if noding is what you want, but is it possible (through the C api) to ...
In JTS (or GEOS) you can't tell if two linestrings really cross each other. The result is exactly the same whether the lines simply have a point in common but don't cross or if they really cross. Is ...