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On 07/13/2012 04:02 PM, Jaime Palalane wrote:
<blockquote
cite="mid:CAKqXksF7Ed2+GW5XSW9TA5jwq+0xX6XB588E8m0bMc2zDcojqQ@mail.gmail.com"
type="cite">Dear qgis users,<br>
<br>
I am trying to use qGIS to characterize a hydrographic basin but I
am facing problems with the profile from line tool as it is giving
an unique altitude value for my rivers and lengths in grades. I
would like to have them in SI units. I would appreciate some tips
in how to solve this problem.<br>
<br>
</blockquote>
<br>
The units should be the units of the coordinate system. I think that
if you want altitudes and lengths in meters, you'll have to project
both the raster and the line features to a projected CRS with meters
as units.<br>
<br>
<blockquote
cite="mid:CAKqXksF7Ed2+GW5XSW9TA5jwq+0xX6XB588E8m0bMc2zDcojqQ@mail.gmail.com"
type="cite">I am also trying to use the r.water.outlet command to
define a basin draining to a specific point of a stream in raster
format but without success as it gives me back only one cell as
the basin and not a combination of cells which could form a real
basin. Any tutorial or video in how to use this command?<br>
<br>
</blockquote>
<br>
Perhaps the problem is that the outlet point must fall exactly on a
stream. There's a trick using v.distance to find a drainage point
exactly on the stream, described here:<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.surfaces.co.il/?p=241">http://www.surfaces.co.il/?p=241</a><br>
<br>
First add two columns to the streams layer: outlet_x, outlet_y. Now
use v.distance with your outlet point as the "from" parameter, and
the stream as the "to" parameter. Set the upload parameter to
"to_x,to_y" and the column parameter to "outlet_x,outlet_y". Now
after you run, you should get the X,Y coordinates of a point *on the
stream* nearest to your planned outlet point. Use those coordinates
in your r.water.outlet command, and you should get the full drainage
area.<br>
<br>
HTH,<br>
Micha<br>
<br>
<blockquote
cite="mid:CAKqXksF7Ed2+GW5XSW9TA5jwq+0xX6XB588E8m0bMc2zDcojqQ@mail.gmail.com"
type="cite">Saudaçoes!<br>
<br>
Jaime<br>
<br>
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</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Micha Silver
GIS Consultant, Arava Development Co.
<a class="moz-txt-link-freetext" href="http://www.surfaces.co.il">http://www.surfaces.co.il</a></pre>
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