Selon Rafael Krucker <rkruc...@hsr.ch>: > Hello all > > I'm currently trying to do the following, using gdal: > > 1) Combining some tifs into one using gdal_merge, COMPRESS=LZW > 2) Using gdalwarp with cutline to cut out a certain piece of the result > 3) Compressing again using gdalwarp, COMPRESS=LZW
The way gdalwarp works by default will not produce optimal compressed sizes. See https://trac.osgeo.org/gdal/wiki/UserDocs/GdalWarp#GeoTIFFoutput-coCOMPRESSisbroken for explanations and solutions But if you just need to compress as it seems in your step 3, you should rather use gdal_translate than gdalwarp. Will be faster and give optimally compressed files out of the box. > 4) Generating pyramids with gdaladdo > > However, my resulting Tiff is still very big, which hinders performance > greatly in later steps of my workflow. I suspect that some compressions > don't function properly, but I'm not being notified of such happenings > if occuring. > > For instance, applying these steps on five tiffs each no bigger than 1.5 > MB results in a tiff of 12 GB size. > > Any help or suggestions would be greatly appreciated. > > Kind regards > Rafael Krucker > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev