<br><br><div class="gmail_quote">On Thu, Oct 13, 2011 at 9:04 AM, Francesco Mirabella <span dir="ltr"><<a href="mailto:mirabell@unipg.it">mirabell@unipg.it</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hello,<br>
and thanks for your fast replies,<br>
yes, the final result which I'd like to get is a river profile along which the values of the upslope contributing areas can be plotted on a separate y axis.<br>
In order to get this I suppose I should be able to "cat river_long_profile_ascii | r.profile a_raster_map_containing_the upslope_areas" which can provide values in square meters or square km or whatever.<br>
Do you know if such a raster map can be obtained from a dem?<br></blockquote><div><br>Possibly r.flow could help here - in the manual: <br><br>################<br> There are
three possible output maps which can be produced in any combination
simultaneously: a vector map <b>flout</b> of flowlines, a raster map
<b>lgout</b> of flowpath lengths, and a raster map <b>dsout</b> of flowline
densities (which are equal upslope contributed areas per unit width, when
multiplied by resolution).
<br>################<br><br><br>If you need it more accurate, maybe use <em>r.drain for each cell and add</em> the flowpaths accordingly.<br><br>Cheers,<br><br>Rainer<br><br> <br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br>
Francesco<br>
<br>
<br>
<br>
Rainer M Krug wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
It depends on what the OP was looking for - it sounds to me that he is looking for a kind of "dynamic" approach, where one can determine the upslope drainage area for an arbitrary location. Unfortunately, I don't have a solution, but would be quite interested in the answer.<br>
<br>
Cheers,<br>
<br>
Rainer<br>
<br></div><div class="im">
On Thu, Oct 13, 2011 at 8:36 AM, Johannes Radinger <<a href="mailto:jradinger@gmx.at" target="_blank">jradinger@gmx.at</a> <mailto:<a href="mailto:jradinger@gmx.at" target="_blank">jradinger@gmx.at</a>>> wrote:<br>
<br>
Hello Francesco,<br>
<br>
you could use something like the AddOn r.stream.basin<br>
(<a href="http://grass.osgeo.org/wiki/R.stream.*" target="_blank">http://grass.osgeo.org/wiki/<u></u>R.stream.*</a>)<br>
to delineate the basins. Every basin gets a unique number.<br>
Afterwards you can just query how<br>
many cells do have a certain number.<br>
<br>
best regards!<br></div>
Am <a href="tel:13.10.2011" value="+13102011" target="_blank">13.10.2011</a> <tel:<a href="tel:13.10.2011" value="+13102011" target="_blank">13.10.2011</a>> um 08:20 schrieb Francesco Mirabella:<div class="im">
<br>
<br>
> Hi list,<br>
> does anyone know if there is a way to compute the upslope<br>
drainage contributing areas along a stream?<br>
><br>
> thanks for your help!<br>
> Francesco<br>
><br>
><br>
><br>
><br>
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-- <br>
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany)<br>
<br>
Centre of Excellence for Invasion Biology<br>
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</blockquote>
</blockquote></div><br><br clear="all"><br>-- <br>Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany)<br><br>Centre of Excellence for Invasion Biology<br>Stellenbosch University<br>
South Africa<br><br>Tel : +33 - (0)9 53 10 27 44<br>Cell: +33 - (0)6 85 62 59 98<br>Fax (F): +33 - (0)9 58 10 27 44<br><br>Fax (D): +49 - (0)3 21 21 25 22 44<br><br>email: <a href="mailto:Rainer@krugs.de" target="_blank">Rainer@krugs.de</a><br>
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