Hi, I've just implemented an improvement in gdalwarp to automatically set the existing SKIP_NOSOURCE=YES warping option when it is safe to do so. This option helps improving performance when a source dataset doesn't cover the full size of the output dataset. This is particularly interesting when warping into a fixed tiling scheme and/or when use gdalwarp in mosaicing situations. On a test scenario where the output tile is much larger than the extent of the source datasets, this for example cut down the time from 14 seconds to 2 seconds
The logic to determine when SKIP_NOSOURCE=YES can be automatically set isn't trivial, so please test and report if there are situations where this would result in unexpected results. Note that this will result in files potentially binary different than before (blocks not being written in the same order), but the pixel values as read by GDAL should be the same as without the optimization. Even -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev