We use ArcObjects pretty heavily and simplify polygons using something similar to the
ITopologicalOperation::Simplify(void). No tolerance is passed in as the parameter (it uses the XY tolerance of the associated spatial reference).
Now, we're using OGR for some functionality and would like to simplify using this library. What's the equivalent? I'm aware of
OGRGeometry::SimplifyPreserveTopology(double dTolerance) but I'm not sure where to get the tolerance from the in OGR library.