[OSGeo-Discuss] Built a mask

Richard Greenwood richard.greenwood at gmail.com
Thu Feb 16 18:11:23 PST 2012


I have not worked with a GRASS mask for many years, but my
recollection is that any raster layer can be a mask if you just name
it as such. You might get more responses if you pose your question on
the GRASS user's list
This list is for more general Open Source Geospatial discussion than
for questions specific to a particular software.


On Thu, Feb 16, 2012 at 10:28 AM, Elena Bastianon
<elena.bastianon at gmail.com> wrote:
> Hello,
> What I must do is create a mask in GRASS which takes consideration on the
> slope of the study area.
> I'm studying a river and I have the GDEM of the area, what I've done so far
> it was extrapolate some sections in order to have the longitudinal profile /
> slope (and that is a line), to do that I used the GDEM, following the main
> channel line's.
> Now my problem  is how to transform this informations in a surface.
> My idea would be to create something like a GDEM from the longitudinal
> profile (I tried with v.surf.rast) and then with r.mapcalc get the mask
> (with r.mapcalc, define the mask choosing the points of the GDEM which are
> located at an altitude of about 5-6m larger than that of the longitudinal
> profile).
> Does anyone have any suggestions?
> Thanks in advance for availability
> Have a nice day
> --
> Elena
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Richard Greenwood
richard.greenwood at gmail.com

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