[GRASS-user] Problem with slope modeling .

Hamish hamish_nospam at yahoo.com
Tue May 1 05:23:48 EDT 2007

Radomir wrote:
> The r.surf.contour methods gives much worse results then RST (see the
> Elevation graph).

r.surf.contour will only work with interger values (so far).
can you try something like:

r.mapcalc "map10000= int(map * 10000)"
r.surf.contour in=map10000 out=map10000_rsc
r.mapcalc "map_rsc = map10000_rsc / 10000.0"

then you can produce a smoother result in spite of r.surf.contour's

> It was really interesting to analyse the output vector map. It seems
> that when the distance between two isolines is "large" GRASS "puts the
> next isoline" very close to the previous and this is how the "waves"
> comes from.

Could you specify the module name, not just "GRASS 'puts the next
isoline'"? GRASS is the whole, there are many different methods within
its modules, not just one, so it's hard to know which one you mean to
refer to.


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