Dear GRASS-Users,
I have a map of local elevation that I would like to alter the values of and
re-class as a experiment to aid visualisation & interpretation.
1) Currently the cells are floating point with z-values like 0.0151666768416021
- I would like to do is round the elevation values to 2
Rebecca wrote:
> I have a map of local elevation that I would like to alter the
> values of and re-class as a experiment to aid visualisation &
> interpretation.
firstly, the r.reclass module might help, as may r.contour.
> 1) Currently the cells are floating point with z-values like
> 0.01516667
Hamish wrote:
> there are a couple ways to do it, here's one:
> r.mapcalc "map.2dp = int(0.5 + (map.15g * 100))/100.0"
>
> the 0.5 is added because int() truncates instead of
> rounding.
mind that if your values go negative, int() and floor() are
not the same..
> another common way is with log
Hamish wrote:
> there are a couple ways to do it, here's one:
> r.mapcalc "map.2dp = int(0.5 + (map.15g * 100))/100.0"
>
> the 0.5 is added because int() truncates instead of rounding.
Note that r.mapcalc has a round() function.
--
Glynn Clements
___
Hi,
On Fri, Feb 15, 2013 at 2:09 PM, Glynn Clements wrote:
>
> Hamish wrote:
>
> > there are a couple ways to do it, here's one:
> > r.mapcalc "map.2dp = int(0.5 + (map.15g * 100))/100.0"
> >
> > the 0.5 is added because int() truncates instead of rounding.
>
> Note that r.mapcalc has a round()
