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Yes, it was scale ratio!, my DEM has degree units for X Y and meters
for elevation. Thank you very much Gerardo, Marco and Paolo, and I'
so sorry, I didn't understand the instruccions before.<br>
<br>
Carlos<br>
<br>
<br>
El 16/08/11 17:27, Gerardo Jimenez escribió:
<blockquote cite="mid:SNT119-W8CC285FFE58EF8B59741395290@phx.gbl"
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<font class="Apple-style-span" face="Tahoma" size="2">It could
be that you did not set the proper scale value. If your data
is in lat/lon the scale ratio must be set at 111120. If your
data is in meters 1 is ok. This setting relates to "how many
vertical units (m) to horizontal units. Then if your data is
in decimal degrees, 111120 meters are equivalent to a degree.
That is the reason also if your</font><font
class="Apple-style-span" face="Tahoma" size="2"> data is in
meters tere is 1 vertical unit to 1 horizontal unit. Check
this out</font>
<div><font class="Apple-style-span" face="Tahoma" size="2"><br>
</font></div>
<div><font class="Apple-style-span" face="Tahoma" size="2"><a
moz-do-not-send="true"
href="http://www.gdal.org/gdaldem.html">http://www.gdal.org/gdaldem.html</a><br>
</font><br>
</div>
<div>and go to the slope section</div>
<div><br>
</div>
<div>Hope it helps<br>
<font class="Apple-style-span" face="Tahoma" size="2">Gerardo
Jiménez Delgado</font><br>
<font class="Apple-style-span" face="Tahoma" size="2">Instituto
de Investigaciones Antropológicas</font><br>
<font class="Apple-style-span" face="Tahoma" size="2">Universidad
Nacional Autónoma de México</font><br>
<font class="Apple-style-span" face="Tahoma" size="2">Ciudad
Universitaria s/n</font><br>
<font class="Apple-style-span" face="Tahoma" size="2">Coyoacan
04510
Mexico City</font><br>
<font class="Apple-style-span" face="Tahoma" size="2">Mexico
56 22 95 16</font><br>
<br>
<div style="font-family: Tahoma; font-size: 10pt;">
<hr id="stopSpelling">Date: Mon, 15 Aug 2011 20:47:00 -0500<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:sig.upagu@gmail.com">sig.upagu@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>
Subject: [Qgis-user] DEM terrain models problem<br>
<br>
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charset=ISO-8859-1">
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Dear QGIS list members:<br>
<br>
I've got some ASTER_GDEM data (<a moz-do-not-send="true"
class="ecxmoz-txt-link-freetext"
href="http://www.gdem.aster.ersdac.or.jp/search.jsp"
target="_blank">http://www.gdem.aster.ersdac.or.jp/search.jsp</a>)
and I was testing the <i>DEM terrain models</i> GDAL tool
with my DEM.<br>
<br>
The shaded relief map that I got is ok, but slope map is
wrong: this one has 0 (zero) and over 89 degrees only,
(there are not 1, 2, 3....88) . I've tried all options but I
got always a 0 and 89 (and decimal) degress map.<br>
<br>
I've tried with the r.slope module (GRASS pluggin) and it
does a good job: I get a full-slope map.<br>
<br>
My distro: QGIS 1.7 on Ubuntu 11.04. A month ago I fixed it
for the TIFF images problem reported here: <a
moz-do-not-send="true" class="ecxmoz-txt-link-freetext"
href="http://osgeo-org.1803224.n2.nabble.com/gdal-1-8-0-no-tiff-support-anymore-in-Ubuntu-11-04-Natty-tc6365327.html"
target="_blank">http://osgeo-org.1803224.n2.nabble.com/gdal-1-8-0-no-tiff-support-anymore-in-Ubuntu-11-04-Natty-tc6365327.html</a>
It is relationed with this slopes problem? <br>
<br>
As I said, the GRASS pluggin did the right work, but I'd
liked GDAL tool does too. Perhaps I did something wrong or
Is something wrong with this tool?<br>
<br>
Thank you in advance for sugestions<br>
<br>
Regards from Cajamarca - Perú<br>
<br>
Carlos Cerdán<br>
<br>
<br>
<br>
<br>
<br>
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