I'm using today's Grass 6.3.svn source, gdal 1.5.0. $ gdalinfo --formats | grep "GRASS" GRASS (ro): GRASS Database Rasters (5.7+)
In Spearfish60: $ r.info -t elevation.10m datatype=DCELL $ g.region rast=elevation.10m -p projection: 1 (UTM) zone: 13 datum: nad27 ellipsoid: clark66 north: 4928000 south: 4914020 west: 590010 east: 609000 nsres: 10 ewres: 10 rows: 1398 cols: 1899 cells: 2654802 The following commands all produce tiffs that display completely black in off-the-shelf image viewers in Ubuntu 7.10: (Eye of Gnome 2.20.1, GIMP 2.4.4) $ r.out.gdal input=elevation.10m output=elevation.10m.tif type=Byte $ r.out.gdal input=elevation.10m output=elevation.10m.tif type=Byte createopt="INTERLEAVE=PIXEL" $ r.out.gdal input=elevation.10m output=elevation.10m.tif type=Byte createopt="INTERLEAVE=PIXEL,PROFILE=GeoTIFF" $ r.out.gdal input=elevation.10m output=elevation.10m.tif type=Byte createopt="INTERLEAVE=PIXEL,PROFILE=BASELINE" These commands give a completely blank raster in the same image viewers: $ r.out.gdal input=elevation.10m output=elevation.10m.tif type=UInt16 $ r.out.gdal input=elevation.10m output=elevation.10m.tif type=UInt16 createopt="INTERLEAVE=PIXEL" $ r.out.gdal input=elevation.10m output=elevation.10m.tif type=UInt16 createopt="INTERLEAVE=PIXEL,PROFILE=GeoTIFF" $ r.out.gdal input=elevation.10m output=elevation.10m.tif type=UInt16 createopt="INTERLEAVE=PIXEL,PROFILE=BASELINE" According to r.out.gdal manual, the type= parameter should be set to either Byte or UInt16 to preserve the color table. I can't get either type to output anything useful. Using any other type causes r.out.gdal to complain that the color tables won't be preserved. What am I missing here? Even the example from the r.out.gdal manual page produces an error and a tiff that does not display anything: $ r.out.gdal in=elevation.10m out=ned_elev10m.tif type=Float64 createopt="INTERLEAVE=PIXEL,TFW=YES" Exporting to GDAL data type: Float64 ERROR 6: SetColorTable() only supported for Byte or UInt16 bands in TIFF format. 100% r.out.gdal complete. Is a tiff without a color table even useful? I'd settle for a lossy, interpolated color table. Normally I would just use r.out.tiff as a workaround, but I think this module ought to output georeferenced tiffs with sane color tables. In any case, I can't use the tiff-with-worldfile workaround; I need geotiffs with the projection info written into the header - *with* a color table. ~ Eric. _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user