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GeoInformatica

, Volume 4, Issue 4, pp 349–373 | Cite as

Terrain Reconstruction from Contours by Skeleton Construction

  • David Thibault
  • Christopher M. Gold
Article

Abstract

Generating terrain models from contour input is still an important process. Most methods have been unsatisfactory, as they either do not preserve the form of minor ridges and valleys, or else they are poor at modeling slopes. A method is described here, based on curve extraction and generalization techniques, that is guaranteed to preserve the topological relationships between curve segments. The skeleton, or Medial Axis Transform, can be extracted from the Voronoi diagram of a well-sampled contour map and used to extract additional points that eliminate cases of “flat triangles” in a triangulation. Elevation estimates may be made at these points. Based on this approach it is possible to make reasonable estimates of slopes for terrain models, and to extract meaningful intermediate points for triangulated irregular networks (TINs).

terrain modeling Delaunay/Voronoi diagrams contour lines skeleton generalization 

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • David Thibault
    • 1
  • Christopher M. Gold
    • 2
    • 3
  1. 1.Center for Research in GeomaticsLaval UniversityQuebec City, QcCanada
  2. 2.Center for Research in GeomaticsLaval UniversityQuebec City, QcCanada
  3. 3.Department of Land Surveying and Geo-InformaticsHong Kong Polytechnic University, Hung HomKowloonHong Kong

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