Hi Looch,
On 12/19/06, I-Gualano, Luciano <[EMAIL PROTECTED]> wrote:
Thanks for everyones help and quick responses. I can create the 8
geotiff files (approx 1.8Gb each).
Just some more questions.
1) To create the elevation file using topography (2km) png file is the
following command correct
gdal_translate srtm_ramp2.world.21600x10800.png topo.tif
gdaladdo -r average topo.tif 2 4 8 16 32 64 128 256
2) To build the OSG earth output file (ive) using the 8 geotiff and
elevation data file is the following command correct?
osgdem --bluemarble-west -t A1.tif -t A2.tif -t B1.tif -t B2.tif
--bluemarble-east -t C1.tif -t C2.tif -t D1.tif -t D2.tif --whole-globe
-d topo.tif --geocentric -l 12 -o earth.ive
The --bluemarble-west/east only applies to the next -t or -d, so the
-t A2.tif etc won't inherit this setting. However, this isn't what
you'd want anyway as you can't have A1 to B2 all overlapping each
other... What you'd need to do is ensure that these .tif files all
have the correct geospatial coords assigned to them, if they do
already then you want need the --bluemarble-west as osgdem/osgTerrain
can pick up the settings directly from the file rather than having to
assume it.
3) If the above command is incorrect, do I use gdal_merge script to
create a west and east tif by creating a mosiac image. For example use
A1.tif, A2.tif, B1.tif, and B2.tif to create west.tif.
osgdem can handle masiacs you just need to ensure that that the
coordinate systems are set up correctly, even gdal will need this to
do a merge so you might as well leave it to osgdem to handle all the
seperate tif files.
4) What should I expect the total storage size of all the tiles to be? 5
Gb?
Size depends on the compression used on source vs output and the level
you descend too, the final result will probably be of the order of
magnititude of 5 Gbs, it may also take 24 hours to build...
Robert.
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