Hi Cedric, I use another elevation data which are grayscale images. To create a good height relief whole earth database;
1 - Open up the ftp://veftp.gsfc.nasa.gov/bluemarble/ and download land_shallow_topo_west.tif and land_shallow_topo_east.tif 2 - Open up the http://visibleearth.nasa.gov/view_detail.php?id=8391 and download srtm_ramp2.world.21600x10800.jpg (P.S. You can download srtm_ramp2.world.86400x43200.bin.gz.torrent or srtm_ramp2.world.5400x2700.jpg but I created my earth database with using srtm_ramp2.world.21600x10800.jpg) 3 - Use "gdal_translate srtm_ramp2.world.21600x10800.jpg topo_unreferenced.tif" command to convert jpg to tiff format. 4 - At this point created topo_unreferenced.tif image hasn't WGS84 reference meta-data. So we dig in these data with using gdal_vrt files. For topo_unrefereced.tif images our vrt file is like below; ------------------------------reference.vrt---------------------------- <VRTDataset rasterXSize="21600" rasterYSize="10800"> <SRS>WGS84</SRS> <GeoTransform>180,0.016666666666666666,0,90,0, 0.016666666666666666</ GeoTransform> <VRTRasterBand dataType="UInt16" band="1"> <ColorInterp>Gray</ColorInterp> <SimpleSource> <SourceFilename>topo_unrefereced.tif</SourceFilename> <SourceBand>1</SourceBand> <SrcRect xOff="0" yOff="0" xSize="21600" ySize="10800"/> <DstRect xOff="0" yOff="0" xSize="21600" ySize="10800"/> </SimpleSource> </VRTRasterBand> </VRTDataset> ------------------------------reference.vrt---------------------------- 5 - Copy and paste the reference.vrt xml data to the notepad and save on your disk. 6 - Use "gdal_translate referance.vrt topo_referenced.tif" command. This command create you topo_referenced.tif real whole earth elevation data. 7 - osgdem --bluemarble-east -t land_shallow_topo_east.tif --bluemarble-west -t land_shallow_topo_west.tif --geocentric -o earth/earth.ive -so build.source 8 - osgdem -s build.source -d topo_referenced.tif -v 750.0 -l 6 9 - After build operation you should get well height relief whole earth database. If any problem you get while the operation, only ask me. Best Regards. Ümit Uzun
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