Le dimanche 17 juin 2012 18:45:01, Smith, Michael ERDC-RDE-CRREL-NH a écrit : > I did originally use -dstalpha. I had dropped it when creating the > geotiffs as I used PHOTOMETRIC=YCBCR as a creation option. > > I'll try with -dstalpha and dropping the YCBCR.
Ah, ok, JPEG compression is indeed incompatible with alpha band. But you could however use a mask band, which recent MapServer should handle. gdalwarp rpc -of vrt -overwrite -t_srs epsg:3857 -r cubic --config GDAL_CACHEMAX 500 -wm 500 $1 $1.vrt -dstalpha gdal_translate -b 1 -b 2 -b 3 -mask 4 -co "TILED=YES" -co "JPEG_QUALITY=95" - co "COMPRESS=JPEG" -co "PHOTOMETRIC=YCBCR" $1.vrt $1.tif gdaladdo --config COMPRESS_OVERVIEW JPEG --config PHOTOMETRIC_OVERVIEW YCBCR --config INTERLEAVE_OVERVIEW PIXEL $1.tif 2 4 8 16 32 > > Is there a known issue with using the vrts inside a tileindex that makes > it so slow? RPC reprojection is probably slow, and VRT can add some overhead, especially if the tiling scheme it adopts (128x128 blocks) is very different from the source raster. Furthermore, if you make a request that is a zoom out, the VRT cannot benefit from overviews of the source raster and will make reprojection at full scale, before zooming out. _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev