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.
Carlos
El 16/08/11 17:27, Gerardo Jimenez escribió:
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 data is in meters tere is 1 vertical unit to 1 horizontal
unit. Check this out
http://www.gdal.org/gdaldem.html
and go to the slope section
Hope it helps
Gerardo Jiménez Delgado
Instituto de Investigaciones Antropológicas
Universidad Nacional Autónoma de México
Ciudad Universitaria s/n
Coyoacan 04510 Mexico City
Mexico 56 22 95 16
------------------------------------------------------------------------
Date: Mon, 15 Aug 2011 20:47:00 -0500
From: [email protected]
To: [email protected]
Subject: [Qgis-user] DEM terrain models problem
Dear QGIS list members:
I've got some ASTER_GDEM data
(http://www.gdem.aster.ersdac.or.jp/search.jsp) and I was testing the
/DEM terrain models/ GDAL tool with my DEM.
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.
I've tried with the r.slope module (GRASS pluggin) and it does a good
job: I get a full-slope map.
My distro: QGIS 1.7 on Ubuntu 11.04. A month ago I fixed it for the
TIFF images problem reported here:
http://osgeo-org.1803224.n2.nabble.com/gdal-1-8-0-no-tiff-support-anymore-in-Ubuntu-11-04-Natty-tc6365327.html
It is relationed with this slopes problem?
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?
Thank you in advance for sugestions
Regards from Cajamarca - Perú
Carlos Cerdán
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