[gdal-dev] Hillshade + Topographic Map??
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#//009t01v100 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. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] Hillshade + Topographic Map??
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#//009t01v100 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. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Frank BRONIEWSKI METRICO s.à r.l. géomètres technologies d'information géographique rue des Romains 36 L-5433 NIEDERDONVEN tél.: +352 26 74 94 - 28 fax.: +352 26 74 94 99 http://www.metrico.lu ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] Hillshade + Topographic Map??
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' module. Volker 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#//009t01v100 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. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
