Yes, that's probably doable, but clearly not trivial. I add a hard time (look at how ugly/complicated the code now looks...) doing something similar in GDALSuggestedWarpOutput2() to guess the extent of the target extent when such discontinuities in the reprojection occur (and it probably doesn't solve 100% situations). Something similar (in spirit) would probably be needed in GDALWarpOperation::ComputeSourceWindow().
Yes, big it is and I confess that I didn't even try to comprehend what it does. But my suggestion was perhaps simpler (in mind). My idea was to just give a warning that a discontinuity had occurred and advise that the SAMPLE_STEPS can be of much help. And how to detect the discontinuity? Sure that's the key question, but on the current case the -180 and the 180 points should be coincident on the target grid, or at least very, very close (in terms of target grid steps). If they aren't ... ring the bell
Well just a thought. Joaquim _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
