[GRASS-user] Extrac values with r.mapcalc

[ambijat]

Hi! Gaspar,
you can do it one way as follows.
1) create a vector of desired area that you would like to extract values 
for.
2) use v.to rast for converting it into a raster use value = 1 for that 
raster
3)open mapcalc and put input raster as A and new created raster as B
4) enter formula if(B == 1), A, 0), also name the new raster
5) the new raster shall have the values from the input raster

I hope I got it right for you.
rgs,
Ambrish Dhaka


On 4/14/2011 3:16 AM, Gaspar Reyes Póndigo wrote:
> Hello, Dear grass_user. /My first/ forum /participation/ in the 
> grass_user list email.
>
> How to extract values of map raster with r.mapcalc? I need make new 
> map raster based on specific value  of other raster.
>
>
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