[osg-users] LOD levels in Terrain generation.

Will Dicharry wdicharry at gmail.com
Thu Oct 18 17:34:05 PDT 2007


I'm not sure if this is what you're looking for, but you can pre-process
your imagery using the gdalwarp utility.  I believe that it contains options
for rescaling and interpolating the source imagery while maintaining the
georeferenced extents of the imagery.

Will

On 10/18/07, om <omkaranathan at darshan3d.com> wrote:
>
>  Hi Christoph,
>
> Thanks for your reply.
> As you suggested, it is understandable that data generation stops at the
> original resolution. Is there any option which helps in creating the
> required data by interpolation, in case we require a higher image
> resolution?
>
> Thanks
>
> Om
>
> Christoph Ehrler wrote:
>
> Hi Om,
> just a simple answer and some more questions because I'm not one of
> the VirtualPlanetBuilder/osgDEM coders.
>
> The topmost LOD is the one with the worst resolution (only one tile).
> The deepest LOD is the one with the best resolution.
> When osgDEM arrives at the resolution of the original data it stops
> since doing more levels of detail is ridiculous.
>
> One question for me is how big is LOD 1 ???
> A tile of size 512x512 pixel ??
> Is it possible to reduce the LOD count while preserving that the
> highest LOD is the original resolution??? Meaning, I want to reach my
> original resolution no matter what I definet as LOD count.
>
> Cheers
> Christoph
> On 10/18/07, om <omkaranathan at darshan3d.com> <omkaranathan at darshan3d.com> wrote:
>
>  Hi,
>
> I tried to generate paged LOD database using osgdem (Using texture map
> and .dem file as input).
> The application is unable to generate the LOD database in case of high
> no of levels(I tried with a level 9 input but only 6 levels were created).
> Application quits after generating these levels without any warning or
> error message.
> Is there any dependency between the image resolution and no of levels?
> Or is it because of some other reasons?
>
> Thanks.
>
> Om
>
>
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