SOAR is an acronym for Stateless, One-pass Adaptive Refinement, which well summarizes the characteristics of the view-dependent mesh refinement and rendering algorithm described in the following papers. SOAR v1.11 is a stripped-down C implementation of these terrain visualization algorithms.
Visualization of Large Terrains Made Easy. Peter Lindstrom and Valerio Pascucci, Proceedings of IEEE Visualization 2001, pp. 63-370, 574, October 2001.
Terrain Simplification Simplified: A General Framework for View-Dependent Out-of-Core Visualization. Peter Lindstrom and Valerio Pascucci, IEEE Transactions on Visualization and Computer Graphics, 8(3):239-254, July-September 2002.
SOAR is Copyright (c) 2002 University of California, LLNL. See the README file in the tar file for further details. SOAR may be downloaded and used free of charge. The text file "LICENSE" contains further details on distribution and commercialization.
Questions and comments on this implementation or the papers are welcome. Data for a Puget Sound model is available.