[GRASS-user] r.threshold: Where is the output?

[Rich Shepard]

On Thu, 21 Jun 2012, Margherita Di Leo wrote:

> you can use abs function of r.mapcalc

madi,

   There are broad valleys on either side of the mountain and those probably
account for the large number of negative accumulation values. r.describe
tells me:

r.describe map=dem.accum
  100%
* -1513339.000000 thru -1455846.764706 -1448660.235294 thru -1427100.647059 
-1355235.352941 thru -1348048.823529 -1348048.823529 thru -1340862.294118 
-1297743.117647 thru -1276183.529412 -1261810.470588 thru -1254623.941176 
-1254623.941176 thru -1247437.411765 -974349.294118 thru -952789.705882 
-880924.411765 thru -873737.882353 -873737.882353 thru -866551.352941 
-859364.823529 thru -852178.294118 -844991.764706 thru -751566.882353 
-737193.823529 thru -708447.705882 -557530.588235 thru -550344.058824 
-550344.058824 thru -543157.529412 -535971.000000 thru -528784.470588 
-507224.882353 thru -449732.647059 -428173.058824 thru -392240.411765 
-385053.882353 thru -363494.294118 -349121.235294 thru -341934.705882 
-320375.117647 thru 96443.588235 110816.647059 thru 118003.176471 
125189.705882 thru 153935.823529 161122.352941 thru 182681.941176 
197055.000000 thru 204241.529412 211428.058824 thru 247360.705882 
297666.411765 thru 319226.000000

   I'll tpply abs() within r.mapcalc.

Thanks,

Rich