$C^1$-continuous terrain reconstruction from sparse contours
Kai Hormann,
Salvatore Spinello,
and Peter Schröder
Proc. 8th Int. Worksh. Vision, Modeling, and Visualization, T. Ertl,
B. Girod,
G. Greiner,
H. Niemann,
Hans-Peter Seidel,
E. Steinbach,
and R. Westermann, ed., IOS Press, 2003, pp. 289–297
http://www.multires.caltech.edu/pubs/TerrRecon.pdf
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