[GRASS-user] Hello dear sir,I have a question to consult you.

[Markus Neteler]

Mwhei wrote:
> 
> Hello dear sir,.
>      I have a question to consult you.I want to know is there a  command  
> to  implement that  the cells values of  one raster  layer  to 
> minus  the cells values of another raster layer ? Would you please  give
> me some suggestions? Any help will be ok. Thank  you very much!
>                                                                                                                                                                     
> Sincerely yours,
>                                                                                                                                                                                   
> Yang
> 

You can do this with r.mapcalc. Please check
http://grass.itc.it/grass62/manuals/html62_user/r.mapcalc.html

r.mapcalc "newmap=oldmap1 - oldmap2"

Markus
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