[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 ...

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 r...@linfiniti.com I've got a DEM, basically a cut-out of SRTM data. Trying to

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.