And another tick, if you will use different srtm elevation image while creating database, you should chage the vrt xml data for new image resolution values.
2008/9/1 Ümit Uzun <[EMAIL PROTECTED]> > Hi Cedric, > > Yes, you can make your terrain with this method. There would not be any > problem because I create > http://img222.imageshack.us/my.php?image=tasimearthjb4.png database with > using this way. But I suggest you to create smaller one and if there is not > problem you can create bigger one with comfort. > > May it be easy. Best Regards. > > Ümit Uzun > > 2008/9/1 Cedric Pinson <[EMAIL PROTECTED]> > > Hi Ümit Uzun >> If you tell me that the problem does not appear with those map, i will try >> the big one in raw binary format. >> >> thank you for your help >> >> >> Ümit Uzun wrote: >> >>> 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 >>> ------------------------------------------------------------------------ >>> >>> _______________________________________________ >>> osg-users mailing list >>> [email protected] >>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >>> >>> >> >> -- >> +33 (0) 6 63 20 03 56 Cedric Pinson mailto:[EMAIL PROTECTED] >> http://www.plopbyte.net >> >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > >
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