[GRASS-user] negative slope values and movement costs

Hamish hamish_nospam at yahoo.com
Thu Feb 1 17:12:55 EST 2007

mlage at usal.es wrote:
> In the slope maps computed through r.slope.aspect, all slope values are
> always positive? Is there any way to transform positive slope values into
> negative values, to estimate movement costs in a slope map?

r.slope.aspect has the format= option for slope. 

          format   Format for reporting the slope
                    options: degrees,percent
                    default: degrees

if you want something different use r.mapcalc, the map calculator.


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