[GRASS-user] generating a binary raster map

[Hamish]

gary wrote:

> Thanks to the efforts of Bejamin Ducke, I now have r.cva installed. 
> However, it does not take a single point as the target, but requires a
> binary raster map containing either targets or viewpoints. I read the 
> wiki and did some googling, but can't find out how to build such a
> map.


r.mapcalc "map=if(a, b, c)"

read: if (a) then "b", otherwise "c".

see the r.mapcalc help page.


Hamish