>  Have you TRIED osgEarth? 

Yes, in the past I've been working about 8 month on a osgEarth based project.

We used a 2 GB dataset, and performance was really bad until the cache is 
filled.

The new project I'm starting will use dataset about to 5-20 GB, in local 
storage (with some single files up to 4 GB).

So I'm a little afraid about performance using osgEarth, and the resulting 
cache size.

Also, a have a restriction : the dataset coordinate system is selected by the 
end-user, and not necessary a geoid. If I remember well, osgEarth can work only 
with a geoid.

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