Hi, all - I need 4-point (GCP) projective warping ( http://docs.bentley.com/en/I-RASB/irasbhelp171.html) for my very basic rubbersheeting app at http://cartagen.org/maps (getting full-res TMS output working). These are for aerial photographs, not scanned images.
After banging my head against a wall for a while I'm doing it in ImageMagick then gdal_translate then gdalwarp to get a geotiff. This is a bit inefficient. Is there just no major need for a projective warp in gdalwarp, or has nobody ever asked? ImageMagick refers to it as a perspective distort and it is sadly computationally more demanding, but does not compromise GCP positioning to find a fit given 4 corners, as does the polynomial warping. Unless I'm missing something. Suggestions, or am I pretty much on track? Jeff
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