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

[maning sambale]

Thanks for all the advice!  I like the slicing into smaller tiles then
combine with vrt approach.

On Wed, Jun 29, 2011 at 7:16 AM, Giuseppe Sucameli
<brush.tyler at gmail.com> wrote:
> 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
>> _______________________________________________
>> Qgis-user mailing list
>> Qgis-user at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
> --
> Giuseppe Sucameli



-- 
cheers,
maning
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