Hello, As explained in my previous question, I'm trying to create a high resolution topographic map of europe based on cgiar processed srtm data. Of cours, the first step is to merge the 5*5° tif tiles into one big tif, which can be achieved using gdalwarp's mosaic feature.
Simply pasting all the tiles togther trough following code: gdalwarp --config GDAL_CACHEMAX 512 -wm 512 HDA1/srtm_*.ti HDA2/final.tif takes about 20 hours. HDA1/2 are two different harddrives. Now, a second script, pasting first "slices" of 5*30° together, and than merging all the slices: for i in 39 40 41 42 43; do gdalwarp --config GDAL_CACHEMAX 512 -wm 512 HDA1/srtm_$i*.tif HDA2/slice_0$((i-34)).tif done gdalwarp --config GDAL_CACHEMAX 512 -wm 512 HDA2/slice_*.tif HDA1/final.tif takes less than on hour ! Filesize is similar. So what is the trick here ? Is there some quality loss when using gdalwarp ? Felix Schalck _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev