[GRASS-user] r.mapcalc help on eliminating negative values
Luisa Peña
luisapena1979 at gmail.com
Wed Oct 6 06:01:55 EDT 2010
Greetings
I'm having some unexpected difficulties on setting negative valeus to null
using r.mapcalc.
I have a raster named d_data (DCELL) with the following range of values
| Range of data: min = -0.001399 max = 0.356480
Only a few values are negative so I want to set them to null
I have used this expression
if(d_cell at National <0 , null(), d_cell at National)
and when i do r.info output I get:
| Data Type: DCELL
| Range of data: min = nan max = nan
Which is not expected
What am I doing wrong in this expression?
Thanks
Luisa
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