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Hi<br>
<br>
In the newest developer version, the raster terrain plugin in QGIS
has been significantly improved (hillshade function, relief). As
part of these improvements, it is now also possible to set this
scale factor (111120 or 370400 for feet) in the QGIS plugin. More
details about the plugin improvement, especial the relief
functionality, will be described in a blog article soon. <br>
The work was kindly funded by the Swiss Humanitarian Aid unit (<a class="moz-txt-link-freetext" href="http://www.deza.admin.ch/en/Home/Activities/Humanitarian_Aid/Swiss_Humanitarian_Aid_Unit">http://www.deza.admin.ch/en/Home/Activities/Humanitarian_Aid/Swiss_Humanitarian_Aid_Unit</a>).<br>
<br>
Regards,<br>
Marco<br>
<br>
On 11.01.2012 15:11, Gerardo Jimenez wrote:
<blockquote cite="mid:SNT119-W28A404C9A11BC3F31C61A8959E0@phx.gbl"
type="cite">
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For slope calculations with lat lon coordinates and elevation
units in meters or feet you have to be aware to set the proper
"scale (ratio of vertical unit to horizal units)" value. Gdal
help recomends using 111120 if vertical units are in meters and
370400 if they are in feet.
<div><br>
</div>
<div>See</div>
<div><a class="moz-txt-link-freetext" href="http://www.gdal.org/gdaldem.html">http://www.gdal.org/gdaldem.html</a></div>
<div><br>
Hope it helps<br>
<br>
Gerardo Jiménez Delgado<br>
Instituto de Investigaciones Antropológicas<br>
Universidad Nacional Autónoma de México<br>
Ciudad Universitaria s/n<br>
Coyoacan 04510
Mexico City<br>
Mexico
56 22 95 16<br>
<br>
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<hr id="stopSpelling">Date: Wed, 11 Jan 2012 19:18:51 +0530<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:harry.om2000@gmail.com">harry.om2000@gmail.com</a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:Qgis-user@lists.osgeo.org">Qgis-user@lists.osgeo.org</a><br>
CC: <br>
Subject: [Qgis-user] Slope and area/length calculations with
Geographic CRS<br>
<br>
Respected All,<br>
<br>
When we have to calculate area/length in polygon/line
vector layers we have to convert Geographic CRS of the layer
in Projected CRS, and in raster DEM for slope calculations
the same is to be done.<br>
<br>
I am providing continuous free practical trainings to the
Government officials in India of 5-6 days on Application of
Desktop QGIS in Watershed/Rural Development schemes and in
this duration I don't want to put the trainees deep in the
matter of Coordinate Reference System and want to do
everything in GCS-WGS1984. Can there be any solution
presently or in future for calculating area/length in vector
and slope etc. in DEM with geographic coordinate system. <br>
<br>
Regards<br>
<br>
Harish<br>
<br>
-- <br>
Harish Kumar Solanki, Assistant Professor<br>
National Institute of Rural Development (NIRD), MoRD, GoI <br>
Jaipur, INDIA- 302006<br>
<br>
<br>
Email- <a moz-do-not-send="true"
href="mailto:hksolanki@nird.gov.in">hksolanki@nird.gov.in</a>,
<a moz-do-not-send="true"
href="mailto:harry.om2000@gmail.com">harry.om2000@gmail.com</a>,
<br>
Tele-Fax-0141-2209904, Mo.- 09414291732, 09214446732<br>
Website- <a moz-do-not-send="true"
href="http://www.nird.org.in" target="_blank">http://www.nird.org.in,
http://watershed.rajasthan.gov.in/</a><br>
LinkedIn: <a moz-do-not-send="true"
href="http://www.linkedIn.com/in/hksolanki"
target="_blank">www.linkedIn.com/in/hksolanki</a><br>
<br>
<br>
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<pre class="moz-signature" cols="72">--
Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Churerstrasse 22, CH-8808 Pfäffikon SZ, Switzerland
<a class="moz-txt-link-abbreviated" href="mailto:marco.hugentobler@sourcepole.ch">marco.hugentobler@sourcepole.ch</a> <a class="moz-txt-link-freetext" href="http://www.sourcepole.ch">http://www.sourcepole.ch</a>
Technical Advisor QGIS Project Steering Committee</pre>
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