FYI
/Sik
FYI - let me know if you have tried it out ...
/Sik
Quote
RATMAN is a real-time terrain rendering framework able to asynchronously access terrain information from remote servers. It consists of a high performance portable rendering library used as a rendering engine, and of a simple networked viewer integrated with many different data sources.
The terrain rendering technology behind RATMAN is based on a compressed multiresolution representation based on the BDAM (Batched Dynamic Adaptive Meshes) continuous level-of-detail framework. The structure combines the aggressive compression rates of wavelet-based image representations with the ability to ensure overall geometric continuity for variable resolution views of planar and spherical terrains with no need for run-time stitching. In RATMAN, the implementation has been simplified to ensure execution even on very low-end graphics platforms.
The overall system has been used in a number of large scale projects, including the 
RATMAN may be used under the terms of the amended GNU General Public License as published by the Free Software Foundation and appearing in the file LICENSEincluded in the software distribution.
Installation instructions are in the file INSTALL. Successful installation results in a library usable for development, as well as in a full-fledged open source geoviewing client. End users can compile and use the RATMAN viewer following the installation istructions. Developer documentation is minimal, and mostly consists in source code documentation.
RATMAN was developed by Enrico Gobbetti, Fabio Marton, Fabio Bettio, and Giovanni Pintore of the CRS4 Visual Computing Group
Read more: http://ratman.sourceforge.net/
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