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<div class="moz-cite-prefix">On 18/07/2012 01:28, Jaime Palalane
wrote:<br>
</div>
<blockquote
cite="mid:CAKqXksGPkyFnbWNG3GeWeoK0CYVXGPb1oO6r=QC76KBEgUpcEw@mail.gmail.com"
type="cite">Regarding the explanation marked below in red, I tried
several times to run the following command v.distance but always
getting the error message "Not enough column names".<br>
<br>
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<p
style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><span
style="font-weight:600">v.distance from=Pxy@Lisboa
from_layer=1 to=Proximo@Lisboa to_type=line to_layer=1
upload=to_x,to_y,to_attr to_column=label column=lat
output=Res3 dmax=-1 dmin=-1</span></p>
<br>
</blockquote>
<br>
The "column=" parameter needs to have the same number of columns as
the "upload=" parameter. So if you want to upload the to_x, to_y and
to_attr values you need to specify in which three columns to put
those values. Your columns parameter will look something like:<br>
columns=x_coord,y_coord,lat<br>
<br>
<blockquote
cite="mid:CAKqXksGPkyFnbWNG3GeWeoK0CYVXGPb1oO6r=QC76KBEgUpcEw@mail.gmail.com"
type="cite">I also did not get any field to specify the column
parameter to "outlet_x,outlet_y". I am running qgis on Linux.<br>
<br>
Jaime<br>
<br>
<br>
<br>
<div class="gmail_quote">2012/7/13 Micha Silver <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:micha@arava.co.il"
target="_blank">micha@arava.co.il</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="direction:ltr" bgcolor="#FFFFFF" text="#000000">
<div class="im"> On 07/13/2012 04:02 PM, Jaime Palalane
wrote:
<blockquote 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>
</div>
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.
<div class="im"><br>
<br>
<blockquote 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>
</div>
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 moz-do-not-send="true"
href="http://www.surfaces.co.il/?p=241" target="_blank">http://www.surfaces.co.il/?p=241</a><br>
<br>
<span style="color:rgb(255,0,0)">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.</span><br>
<br>
HTH,<br>
Micha<br>
<br>
<blockquote type="cite">Saudaçoes!<br>
<br>
Jaime<br>
<br>
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<span class="HOEnZb"><font color="#888888"> </font></span></blockquote>
<span class="HOEnZb"><font color="#888888"> <br>
<br>
<pre cols="72">--
Micha Silver
GIS Consultant, Arava Development Co.
<a moz-do-not-send="true" href="http://www.surfaces.co.il" target="_blank">http://www.surfaces.co.il</a></pre>
</font></span></div>
</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
Jaime Palalane<br>
+258 82 70 56 990<br>
<br>
This mail was received via Mail-SeCure System.<br>
</blockquote>
<font size="+1"></font><br>
<br>
<pre class="moz-signature" cols="72">--
Micha Silver
052-3665918
</pre>
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