DEM generalization based on analysis of geometry and landscape context

Qingsong Fan; Li Yang

doi:10.1117/12.750728

14 November 2007 DEM generalization based on analysis of geometry and landscape context

Qingsong Fan, Li Yang

Proceedings Volume 6790, MIPPR 2007: Remote Sensing and GIS Data Processing and Applications; and Innovative Multispectral Technology and Applications; 679035 (2007) https://doi.org/10.1117/12.750728
Event: International Symposium on Multispectral Image Processing and Pattern Recognition, 2007, Wuhan, China

Abstract

Since different applications have different requests, an already generated DEM does not always suit all the demands of an application. The objective of DEM generalization is the generation of a smooth surface with a lower resolution than the original data, which should preserve topographic features and be appropriate for a smaller scale relief presentation. In this paper, a method of DEM generalization based on analysis of local geometry and landscape context is proposed. Through three kinds of filtering: low-pass filter, threshold-area-based filter and smoothing filter, the approach get four steps to generalize the DEM with lower resolution by an iterative (hierarchical) procedure. In this procedure, analysis of the fundamental landforms is based on a combination of slope gradient and curvature. A case study is put forward to give the detail explanation. Meantime, its reliability is described from elevation range and contours derived from generalized DEMs.

Citation Download Citation

Qingsong Fan and Li Yang "DEM generalization based on analysis of geometry and landscape context", Proc. SPIE 6790, MIPPR 2007: Remote Sensing and GIS Data Processing and Applications; and Innovative Multispectral Technology and Applications, 679035 (14 November 2007); https://doi.org/10.1117/12.750728

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