[osg-users] vpb and GTOPO30

Ümit Uzun umituzun84 at gmail.com
Mon Sep 1 03:21:28 PDT 2008


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 <umituzun84 at gmail.com>

> 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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>>> osg-users at lists.openscenegraph.org
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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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