[gdal-dev] Hillshade + Topographic Map??

Volker Wichmann Volker.Wichmann at uibk.ac.at
Tue Feb 21 08:43:15 EST 2012

The workflow with QGIS described by Frank is also working with SAGA GIS. 
SAGA also allows you to export a permament combination as image file 
(tif, jpg, png ... including world file and kml) with the 'Export Image' 


On 02/21/2012 02:14 PM, Frank Broniewski wrote:
> Hi,
> the standard procedure for creating topo-maps is to overlay your land
> coverage map with a semi-transparent hillshading. I don't know if
> there's a tool for combining/adding two raster maps together in gdal,
> but this is a rather standard procedure in any GIS. In QGIS, for
> example, you can adjust the layer transparency slider to get the effect.
> If you want to create a more permament combination of the land coverage
> and hillshade, you can use a software like GIMP to combine the two maps.
> Mapserver may be able to create a georeferenced version of your
> combination also, as does mapnik. The biggest problem is probably to
> overcome the alpha-transparency for your hillshading, which is not
> something that every raster library is able to handle well.
> Frank
> Am 21.02.2012 11:01, schrieb TJMartin:
>> Hi
>> I have managed to create a hillshade using gdaldem and I have my original
>> topographic rasters. However I do not want the standard grey hillshad or
>> apply a colour ramp.
>> Is there a way to combine the hillshade and topo map together - ie add a
>> transparency or opacity to the hillshade.
>> I have looked at Photopshop and ImageMagik but the results are then not
>> supported in QGIS etc
>> After a trawl through the web the only entry is an ArGIS 10 tutorial
>> http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009t000001v1000000
>> Hopefully that will explain what I would like to achieve
>> thanks for anyones help
>> Tim
>> --
>> View this message in context:
>> http://osgeo-org.1560.n6.nabble.com/Hillshade-Topographic-Map-tp4490698p4490698.html
>> Sent from the GDAL - Dev mailing list archive at Nabble.com.
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