[geotk] Envelope/bbox transformation

[Aaron Braeckel]

Hello,

are there any existing methods for transforming an entire Envelope into 
another CRS?  This is not a trivial process given the potential 
non-linear relationships between different CRSs.  We have previously 
dealt with this by subsampling along the edges of the envelope, applying 
a number of tests (like isNAN() on each point, and ensuring the edges of 
the subsampled polygon do not cross one another) getting the min/max of 
these coordinates, and so on.  Before I head off and re-implement it, 
does anything like this exist in Geotk right now?

Thanks,
Aaron