Hello Hamish, thank you for the response and the hints. They are very useful as i cannot get GRASS7 to work. Best wishes, Raphael.
On 29 Jul 2014, at 2:52 pm, Hamish <hamish.webm...@gmail.com> wrote: > Raphael wrote: >> I wonder if anyone knows how to create a common colour scale for >> different raster maps? I want to display all six maps on the same >> page with the single colour scale but I cannot find how to do this in >> GRASS. >> >> More specifically, I have six raster maps of rainfall for different >> time periods (each has a different range of values) and I would like >> to display them all with the same colour scale. The colour scale >> needs to be constructed using the min and max values of the set of >> six maps (and not just individual maps. > > > For only 6 maps I wouldn't bother with scripting a mix,max variable, > just run r.info in a loop and copy out the min,max by hand. > > for MAP in `g.mlist rast pattern=rain*` ; do > r.info -r $MAP > done > > then make a dummy map with r.mapcalc with overall min and max range. > > min=1.2345 > max=9.8765 > r.mapcalc "color_map = if(row < 10, $min, $max)" > > and then apply it with: > > for MAP in `g.mlist rast pattern=rain*` ; do > r.colors $MAP rast=color_map > done > > Or run r.colors with the rules= option to set up some color rules > by hand, then apply to all in a loop. > > > But what I usually do these days in GRASS 6 is to use the r.stack > addon module to temporarily consider all the maps together, which > allows for the nice 'r.colors -e' equalized histogram color scaling. > You can copy the color map to a small dummy raster with the r.colors > rast= option then delete the stacked raster map if you want to save > space, then apply it to all maps as in the Bourne shell loop above. > > > regards, > Hamish _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
