[osg-users] vpb and GTOPO30

Ümit Uzun umituzun84 at gmail.com
Mon Sep 1 03:15:33 PDT 2008


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 <mornifle at plopbyte.net>

> 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:mornifle at plopbyte.net
> http://www.plopbyte.net
>
>
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