with the goereferenced infos
Cedric
Cedric Pinson wrote:
I tried with the small jpg and it works. I tried with the big one and
with the vrt below it works. I will split it with a geotiff like the
bluemarble notation A1 A2 ...
srtm_ramp2.world.86400x43200.vrt:
<VRTDataset rasterXSize="86400" rasterYSize="43200">
<VRTRasterBand dataType="Int16" band="1" subClass="VRTRawRasterBand">
<ColorInterp>Gray</ColorInterp>
<ByteOrder>MSB</ByteOrder>
<ImageOffset>0</ImageOffset>
<PixelOffset>2</PixelOffset>
<LineOffset>172800</LineOffset>
<SourceFilename
relativeToVRT="1">srtm_ramp2.world.86400x43200.bin</SourceFilename>
</VRTRasterBand>
</VRTDataset>
Thank you for the tips
Cedric
Ümit Uzun wrote:
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] <mailto:[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]
<mailto:[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
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-- +33 (0) 6 63 20 03 56 Cedric Pinson
mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
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<VRTDataset rasterXSize="86400" rasterYSize="43200">
<SRS>GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS
84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9108"]],AXIS["Lat",NORTH],AXIS["Long",EAST],AUTHORITY["EPSG","4326"]]</SRS>
<GeoTransform> -1.8000000000000000e+02, 1.0416666666666667e-03,
0.0000000000000000e+00, 9.0000000000000000e+01, 0.0000000000000000e+00,
-2.0833333333333333e-03</GeoTransform>
<Metadata/>
<VRTRasterBand dataType="Int16" band="1">
<Metadata/>
<ColorInterp>Gray</ColorInterp>
<SimpleSource>
<SourceFilename
relativeToVRT="1">srtm_ramp2.world.86400x43200.vrt</SourceFilename>
<SourceBand>1</SourceBand>
<SrcRect xOff="0" yOff="0" xSize="86400" ySize="43200"/>
<DstRect xOff="0" yOff="0" xSize="86400" ySize="43200"/>
</SimpleSource>
</VRTRasterBand>
</VRTDataset>
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