I was doing some tests on Gvsig for raster reprojection, where gdal warp is used. Gvsig uses a default error threshold of 0.125, which AFAIK makes gdal warp fall back to an approximate transformation. Anyway the reprojection is quite slow, even if significantly faster then GDALGenImgProjTransform.
My test is against a 21698P x 24647L ArcInfo Binary Grid, with a single band with block dimensions 256x4. Bot SRSs are projected. The command is: > gdalwarp -s_srs EPSG:3003 -t_srs EPSG:23032 -et 0.125 hdr.adf test.tiff It took about 9 minutes to complete. Loading the same raster on QGis, which implements its own approximate transformation for on-the-fly reprojection [1], is istantaneous. I was wondering if a similar algorithm could be use within Gdal... Giovanni [1] http://trac.osgeo.org/qgis/browser/trunk/qgis/src/core/qgsrasterprojector.cpp
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