[osg-users] VTP height field issue
ehrler-soft at gmx.de
Wed Sep 19 02:19:32 PDT 2007
Hi @ all,
probably it's a noob question...
I downloaded some data from NASA Blue Marble
and tried to produce a whole earth representation with topography.
But the height field does not match the texture. North and South are
mixed up as well as East and West. But when I start mirroring and
flipping the height field JPG it does not resolve much.
Height field and texture are perfectly matching when using a normal
The problem is, if I use the height field as a texture the "mountains"
show up at a complete different location than they show up as "real
bumps" when using the same file as height map.
BMNG Raw Topography
Blue Marble Next Generation w/ Topography and Bathymetry
I converted both data sources with gdal_translate to TIF files and
added a image pyramid with gdaladdo but it didn't resolve anything.
I am building the paged database to single files (IVE) instead of
building to an archive (OSGA) but as I can remember it makes no
difference for this problem too.
gdal_translate srtm_ramp2.world.21600x10800.jpg srtm_ramp2.world.21600x10800.tif
gdaladdo -r average srtm_ramp2.world.21600x10800.tif 2 4 8 16 32
gdaladdo -r average world.topo.bathy.200406.3x21600x10800.tif 2 4 8 16 32
osgdemd --whole-globe -d srtm_ramp2.world.21600x10800.jpg
--whole-globe -t world.topo.bathy.200406.3x21600x10800.tif -l 5 -v
1000 --geocentric -o blue_marble2.ive
Some suggestions welcome :)
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