[osg-users] vpb: Spherical terrains?

Glenn Waldron gwaldron at gmail.com
Tue Sep 30 09:23:35 PDT 2008


Alejandro,

Try adding --radius-polar in addition to --radius-equator.

Glenn

On Tue, Sep 30, 2008 at 12:13 PM, Alejandro Aguilar Sierra <
algsierra at gmail.com> wrote:

> Hi Robert,
>
> Actually the original data has all the information needed, I gess.
> It's the height map of Earth's Moon, taken from
> http://pubs.usgs.gov/of/2006/1367/
>
> $ gdalinfo ULCN2005_lpo.txt
> Driver: AAIGrid/Arc/Info ASCII Grid
> Files: ULCN2005_lpo.txt
> Size is 5760, 2880
> Coordinate System is `'
> Origin = (-180.000000000000000,90.000000000000000)
> Pixel Size = (0.062500000000000,-0.062500000000000)
> Corner Coordinates:
> Upper Left  (-180.0000000,  90.0000000)
> Lower Left  (-180.0000000, -90.0000000)
> Upper Right ( 180.0000000,  90.0000000)
> Lower Right ( 180.0000000, -90.0000000)
> Center      (   0.0000000,   0.0000000)
> Band 1 Block=5760x1 Type=Int16, ColorInterp=Undefined
>  NoData Value=-32768
>
>
> I converted this file to GeoTiff
>
> gdal_translate -of GTiff -co "TILED=YES" ULCN2005_lpo.txt moon_tiled.tif
>
> Then applied osgdem with a previous false color  texture I had generated.
>
> osgdem --geocentric --whole-globe -t moonrbw2_tex.tif  -d moon_tiled.tif \
>       -l 5 \
>       --radius-equator 1735000 \
>       -v 0.60 \
>       -o lunarsph.ive > errlog2
>
> The result is rather weird (attached). The texture image in this test
> is smaller than the DEM file, just 1024x512 (attached, level 2).
>
> What  am I doing wrong?
>
> Thanks in advance.
>
> -- A.
>
>
>
> On Mon, Sep 29, 2008 at 9:32 AM, Robert Osfield
> <robert.osfield at gmail.com> wrote:
> > Hi Alejandro,
> >
> > The GDAL error that is produced suggests that you are trying to apply
> > a transform to the data when the data doesn't have an geocentric
> > infomation associated with it - which boils down to it can't transform
> > data when it doesn't know what coordinate system it's starting off in.
> >  You need to use imagery/dems with coordinates system or apply them
> > manually.
> >
> > Robert.
> >
> > On Mon, Sep 29, 2008 at 3:00 PM, Alejandro Aguilar Sierra
> > <algsierra at gmail.com> wrote:
> >> Hello:
> >>
> >> As recommended in this forum, I installed both osg and vpb from svn
> >> and I was able to reproduce the example with the Punget terrain.
> >>
> >> Now I want to try it with planets, starting with the moon.
> >>
> >> I started trying with these parameters --geocentric --spherical
> >> --radius-equator 1735000  but I get this error:
> >>
> >> ERROR 1: Unable to compute a transformation between pixel/line
> >> and georeferenced coordinates for moon_heigth.tif.
> >> There is no affine transformation and no GCPs.
> >>
> >> I assume I could add that transformation in a world file or creating a
> >> geotiff file, but I am not sure how to do that.
> >>
> >> I also assume that the bluemarble options only works at Earth scale,
> >> as in this example:
> >>
> >> http://www.andesengineering.com/BlueMarbleViewer/
> >>
> >> Sorry if these are faqs, I am a newvbie and there is not much
> >> documentation about this subject.
> >>
> >> I will appreciate any advice.
> >>
> >> Regards,
> >>
> >> -- Alejandro Sierra
> >> _______________________________________________
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> >>
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> >>
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> >
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>
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>


-- 
Glenn Waldron : Pelican Mapping : http://pelicanmapping.com :
+1.703.652.4791
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