Re: [Qgis-user] Slope not calculating correctly

2012-04-10 Thread Marco Hugentobler 

Hi Rudi

From Version 1.8 on, you can set the parameter 'z-scale' if your x-/y- 
units are different than the z-unit.

If e.g. x-/y- is degrees and z meters, you may set z-Factor 20.

Regards,
Marco

On 10.04.2012 12:20, Rudi Thiede wrote:
I've got a DEM, basically a cut-out of SRTM data. Trying to calculate 
its slope gives me extremely weird output, such that all values are 
>89 degrees.


Dataset: http://linfiniti.com/~rudi/SRTM.zip 



Can anyone confirm? I'm suspecting a local issue though, not the data ...


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--
Dr. Marco Hugentobler
Sourcepole -  Linux&  Open Source Solutions
Churerstrasse 22, CH-8808 Pfäffikon SZ, Switzerland
marco.hugentob...@sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee

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Re: [Qgis-user] Slope not calculating correctly

2012-04-10 Thread G. Allegri 
You're SRTM has geographical CRS (WGS84). You must keep into account when
doing morphological analysis. If you reproject it to a planar projections
(e.g. UTM) the results are correct.

giovanni

2012/4/10 Rudi Thiede 

> I've got a DEM, basically a cut-out of SRTM data. Trying to calculate its
> slope gives me extremely weird output, such that all values are >89 degrees.
>
> Dataset: http://linfiniti.com/~rudi/SRTM.zip
>
> Can anyone confirm? I'm suspecting a local issue though, not the data ...
>
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
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>
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[Qgis-user] Slope not calculating correctly

2012-04-10 Thread Rudi Thiede 
I've got a DEM, basically a cut-out of SRTM data. Trying to calculate its
slope gives me extremely weird output, such that all values are >89 degrees.

Dataset: http://linfiniti.com/~rudi/SRTM.zip

Can anyone confirm? I'm suspecting a local issue though, not the data ...
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