Check out http://vissim.uwf.edu/ This is a growing library of public domain shape models. "This website offers access to a new hierarchical data structure that allows the efficient storage of natural and man-made feature data for use in a multitude of both manual and computerized Mapping, Charting & Geodesy systems."
Also, interesting visualizations at http://www.redlands.edu/x12556.xml
"The
Redlands Institute has completed projects for a wide range of
industries and organizations. The most prominent projects are grouped
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