Jitendra wrote:
I need to create a histogram equalized color
table for a set of rasters.
I can use r.colors for each raster individually
but then the color tables are not comparable
across the maps. Any suggestions on how to
create a color table across multiple rasters?
Nick wrote:
Maybe you're looking for:
r.colors map=$map rast=$other_mapYou can give each map the color table from one
particular map and then it will be comparable
across maps. You'll need to make sure you give it
the color table from the map with the widest
range though, or else you'll have some spots in
your map with no color.
but if you base it on a master map you'll loose the
equalized histogram ability (across all maps in the
set)
to overcome this, there is the r.stack addon module:
http://trac.osgeo.org/grass/browser/grass-addons/raster/r.stack
basically you collect all the series of maps into
one raster, create the equalized color table, then
using 'r.colors rast=' described in Nick's post copy
that overall color table to each component map.
(then delete the temporary stacked raster)
Hamish