World elevation data DEM

http://www.cajomi.de/GeoControl/geocontrol_features.htm

 

http://www.viewfinderpanoramas.org/Coverage%20map%20viewfinderpanoramas_org3.htm

 

http://michaelmak.es/photoshop-and-hgt-files/

 

http://www.georeference.org/doc/import_surface_srtm.htm

 

http://www.earthondrive.com/index.php?route=product/category&path=59

 

http://srtm.csi.cgiar.org/

 

http://www.viewfinderpanoramas.org/dem3.html

 

http://www.osgvisual.org/projects/osgvisual/wiki/OsgTerrainData