[GRASS-user] isoareas from DEM data

[Matthew Perry]

On 11/2/07, Stefan Eriksson <stefan.piaostefan at gmail.com> wrote:
> On Nov 2, 2007 1:48 AM, Moritz Lennert <mlennert at club.worldonline.be> wrote:
> > On Fri, November 2, 2007 00:45, Stefan Eriksson wrote:
> > > Hello,
> > >
> > > I am absolutely new to GRASS, so please forgive me if my questions are
> > > a bit naive.
> > >
> > > I am trying to create isoareas from DEM data.
> > > So far I have managed to create the polygons from DEM data by
> > >> r.mapcalc "newElev2 = round(elevation.dem / 100) * 100"
> > >  100%
> > >> r.to.vect
> >
> > Have you tried r.contour ?
>
> Yes, but I want polygons rather than lines as output. r.contour only
> produce lines, does it not?
>

Another approach might be to classify the raster using r.reclass then
convert to polygons using r.to.vect.

-- 
Matthew T. Perry
http://www.perrygeo.net

"Never ascribe to malice, that which can be adequately explained by
incompetence."