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
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+33 (0) 6 63 20 03 56 Cedric Pinson mailto:[EMAIL PROTECTED]
http://www.plopbyte.net
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