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Accurate Interpolation of Terrain Surfaces from Over-Sampled Grid Data

Coll, Narcis, Marite Guerrieri, Maria-Cecilia Rivara, and J. Antoni Sellares

Proceedings, 17th International Meshing Roundtable, Springer-Verlag, pp.351-368, October 12-15 2008

IMR
PROCEEDINGS

17th International Meshing Roundtable
Pittsburgh, Pennsylvania, U.S.A.
October 12-15, 2008

1 Institut díInform`atica i Aplicacions - Universitat de Girona - Spain
{coll,mariteg,sellares}@ima.udg.edu
2 Department of Computer Science - Universidad de Chile - Chile
mcrivara@dcc.uchile.cl

Abstract
For grid terrain data, we propose a Lepp-surface triangulation method that starts with a coarse initial triangulation of the input data, and incrementally adds data points that reduce the worst edge approximation error in the mesh. The method generalizes a previous Lepp-centroid method in two dimensions as follows: for the edge E, having highest error in the mesh, one or two points close to (one or two) terminal edges associated to E, are inserted in the mesh. The edge error is computed by adding the triangle approximation errors of the two triangles that share E, while each triangle error in L2-norm is computed by using a curvature tensor (good approximation of the surface) at a representative point associated to both triangles. The method produces triangular approximations that capture well the relevant features of the terrain surface by naturally producing well-shaped triangles.

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