[Qgis-user] error with qgis 1.7 shaded relief plugin

[Giuseppe Sucameli]

Hi all,

On Jun 28, 2011, at 10:13 PM, Goyo <goyodiaz at gmail.com> wrote:
> You can try gdaldem: http://www.gdal.org/gdaldem.html. You'll have to
> use the command line since it's not in the qgis raster plugin yet.

wrong, it was implemented yet. 
You can find it in GdalTools plugin since QGis 1.7, run Raster -> GdalDem. 
You should be able to run it in QGis < 1.7, just enable experimental plugins and update your GdalTools plugin.

Cheers

> I personally feel quite uncomfortable and experiment performance
> issues working with large rasters so this is what I do:
> 
> - Keep my raster files small. I get almost all my DEMs from a WCS in
> 1000x1000 px tiles and convert them to 16 bit integers (they are 32
> bits float originally but no DEM has so much precision).
> 
> - Generate seperate hillshades for each DEM. The shaded relief plugin
> is very convenient and has the advantage of generating 128 bit
> rasters.
> 
> - Avoid loading lots of rasters in a qgis project. Better combine them
> using VRT. I use it to combine dozens of DEMs when I need to cover
> larger regions in a single project with very good results.
> 
> Goyo
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--
Giuseppe Sucameli