Dear all, I am facing to a strange problem when exporting floating-point raster data into COG format using GDAL 3.2.1 and GRASS 7.8.5.
Attempt to export raster data by `r.out.gdal format=COG` including color table fails from obvious reasons: ERROR 1: pm_filled_map.tif: Unable to export color table to GeoTIFF file. Color tables can only be written to 1 band or 2 bands Byte or UInt16 GeoTIFF files. GDAL says: Band 1 Block=512x512 Type=Float32, ColorInterp=Palette Metadata: COLOR_TABLE_RULES_COUNT=3 ... QGIS loads data with invalid symbology (which can be easily "fixed" by "Classify" button in the "Symbology" tab). So far understandable. Data exported with `-c` and `-m` flags leads to a grayscale color interpretation. Band 1 Block=512x512 Type=Float32, ColorInterp=Gray BUT after loading a COG file into QGIS no data is displayed! But if I zoom in, the data is magically shown! Originally I thought that it's caused by a broken symbology. But it seems that COG file does not have tiles for smaller scales (identify tool reports no-data for whole AOI on smaller scales). If I create a regular GeoTIFF file the problem with zooming disappears. Another strange thing is that COG file created without `-c` and `-m` flags do not have problems with zoom levels. Any idea what could be wrong? Thanks in advance! Martin -- Martin Landa http://geo.fsv.cvut.cz/gwiki/Landa http://gismentors.cz/mentors/landa _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user