Document Type

Journal Article

Department/Unit

Department of Geography

Title

Generalization of DEM for terrain analysis using a compound method

Language

English

Abstract

This paper reports an investigation into the generalization of a grid-based digital elevation model (DEM) for the purpose of terrain analysis. The focus is on the method of restructuring the grid-based surface elevation data to form a triangulated irregular network (TIN) that is optimized to keep the important terrain features and slope morphology with the minimum number of sample points. The critical points of the terrain surface are extracted from the DEM based on their significance, measured not only by their local relief, but also by their importance in identifying inherent geomorphological and drainage features in the DEM. A compound method is proposed by integrating the traditional point-additive and feature-point methods to construct a drainage-constrained TIN. The outcome is then compared with those derived from other selected methods including filtering, point-additive or feature-point algorithms. The results show that the compound approach is capable of taking advantage of both point-additive and feature-point algorithms to maximally keep the terrain features and to maintain RMSE at an acceptable level, while reducing the elevation data points by over 99%. The analytical result also shows that the proposed method outperforms the compared methods with better control in retaining drainage features at the same level of RMSE. © 2010 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS).

Keywords

DEM/DTM, Generalization, Geomorphology, Surface, Triangulation

Publication Date

2011

Source Publication Title

ISPRS Journal of Photogrammetry and Remote Sensing

Volume

66

Issue

1

Start Page

38

End Page

45

Publisher

Elsevier

DOI

10.1016/j.isprsjprs.2010.08.005

ISSN (print)

09242716

ISSN (electronic)

18728235

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