Is anyone out there using any other tool as an intermediary between gdal and osgdem to accomplish this conversion? I'd like to be able to add some metadata to an archive of geotiifs once and be able to crop any terrain out of them without having to write my own coordinate system/projection/units/datum conversion routines each time.
Thanks,
David
On 8/1/06, Robert Osfield <[EMAIL PROTECTED]> wrote:
Hi David,
The OSG doesn't have any particular units, it just works with the data
you have. If your data ranges from 0 to 10 then its just render that,
its up to your app how your interepret it.
Robert.
On 8/1/06, David Colbert <[EMAIL PROTECTED]> wrote:
> Antoine, thanks for the osgpick suggestion. It confirmed my problems...
>
> It appears to be a units problem that I am having. OSG app units are meters.
> My terrain units are all degrees, so a 10 degree by 10 degree terrain shows
> up in OSG as a 10 meter by 10 meter terrain. Does anyone know how to output
> the terrain in meters? I tried gdalwarping the file from degrees into
> meters by running it through a gdalwarp -t_srs 'EPSG:4326 +units=meters'
> in.tif out.tif, which did change the "degree" unit to "metre" unit as
> returned by gdalinfo.
>
> However, when I run the new file through osgdem, I still get a 10 meter by
> 10 meter terrain. Does osgdem recognize these units changes? I went back and
> made a bunch of test terrains with DEM, SRTM, geotiff, DTEDs, and they all
> ended up as many meters wide as they were degrees wide, no matter how I
> warped them or changed their metadata.
>
> Any ideas?
>
> Thanks in advance,
> David
>
>
>
>
> On 8/1/06, Antoine Hue <[EMAIL PROTECTED]> wrote:
> > David Colbert wrote:
> > > Hello All,
> > >
> > > <snip>
> > >
> > > My terrain looks okay in osgviewer, but when I load it into my app,
> > > it's tiny. Like less than 10 meters across tiny. Obviously, my scale
> > > is messed up, but I cannot find out what more I need to do. I set the
> > > corner anchors using -a_ullr; I tagged 3 points with gcp to provide
> > > additional geocorrelation information; and I set the coordinate system
> > > to match the coordinate system in the README pdf for the blue marble
> > > imagery.
> > >
> > > Did I do something wrong? Is this a bug? Any help would be much
> > > appreciated. The example with pegout says that -xx -yy is unecessary
> > > if you have all the geo metadata, which I believe that I do.
> > >
> > Hello David,
> >
> > You are right, -xx and -yy are not needed in your case.
> > You may check the actual coordinates using osgpick instead of osgviewer
> > (same command usage).
> >
> > Antoine
> >
>
>
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>
>
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