[Gdal-dev] projected bounding box

Jonathan Coles jonathan at intevation.de
Wed Jul 16 04:03:14 EDT 2003

On Mon, 2003-07-14 at 20:29, Frank Warmerdam wrote:
> Jonathan,
> As Ed mentions this is hard to do completely correctly.   The
> GDALSuggestedWarpOutput() is where I have it implemented for the image
> warper applications.  This code basically samples 20 points along each edge
> to transform and compute a bounding box.  This generally gives good results,
> but objects it can be off a bit or even alot in degenerate situations.
> You might want to glance at gdal/alg/gdaltransformer.cpp::GDALSuggsestedWarpOutput().

Thanks, I'm looking into playing around with different amounts of
sampling in my own code. Seems to be working alright for my test cases.
I'll have to watch out for extreme situations.


 Jonathan Coles                                jonathan at intevation.de
 Intevation GmbH                             http://www.intevation.de

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