[GRASS-user] null values

Massimiliano Cannata massimiliano.cannata at supsi.ch
Mon Aug 6 13:53:52 EDT 2007

See r.colors for display colours...
you should define your color rules...

Alternatively you can create/modify your color file (same name of your
raster map) under the colr folder of your mapset.
% -20 20
-20:255:255:255 -10:255:255:255
-10:255:0:0  10:0:255:0
10:255:255:255 20:255:255:255

these represent in withe cells with values lower -10 and upper +10, and
from  red to green in between

lines mean:
(from -20 to -10 ramp between 255:255:255 and 255:255:255)-.>withe
(from -10 to 10 ramp between 255:0:0 and 0:255:0)->red to green
(from 10 to 20 ramp between 255:255:255 and 255:255:255) -.>withe


goldneaa at onid.orst.edu wrote:
> Lets say I have a map with a range of -20, and 20.  I am able to 
> create a legend that only shows -10,10.  But I want my map to only 
> show values from -10,10.  Is there a way to make the areas that are 
> above 10, or below -10 show up as white or null values on the display 
> map.  I have been playing around with val. list in d.rast.  But I have 
> not had much sucess in creating maps that take out my max and min 
> outliers.  Any suggestions?
> Aaron
> _______________________________________________
> grassuser mailing list
> grassuser at grass.itc.it
> http://grass.itc.it/mailman/listinfo/grassuser

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