Method for automatically extracting terrain characteristic line according to vector contour line data

Abstract

The invention discloses a method for automatically extracting a terrain characteristic line according to vector contour line data. The method for automatically extracting the terrain characteristic line according to the vector contour line data comprises the following steps of: determining characteristic points of terrain; classifying the characteristic points to obtain ridge points and valley points; determining judgment factors for generating a ridge line and a valley line; and automatically generating the ridge line and the valley line. The characteristic points of the terrain such as the ridge points and the valley points are determined by using the characteristics of curved lines of a vector contour line and a geometrical morphology analysis method, and then connected to form the terrain characteristic line such as the ridge line and the valley line. The method is high in identification speed, the extracted terrain characteristic line such as the ridge line and the valley line is in accordance with actual terrain change, and errors caused by manual extraction can be effectively eliminated. The method can be used for extracting a terrain contour line from digital terrain data. Furthermore, the method is convenient to operate, simple, and great in practical application value.

Description

technical field [0001] The invention belongs to the technical field of terrain and landform research, and in particular relates to a method for automatically extracting geomorphic lines according to vector contour data. Background technique [0002] In the field of geosciences, how to automatically extract the hidden ridgelines and valleylines from digital contour data and digital terrain model (DEM) data has always been a very important research work. [0003] Scholars at home and abroad have proposed many automatic feature information extraction methods suitable for different research purposes, for example, extracting ridgelines and valley lines from digital contour data and performing contour group synthesis [Fei Lifan. Contour Formation of Topographic Maps]. Group synthesis test. Journal of Wuhan University of Surveying and Mapping Technology, 1993, 18 (Supplement)], D8 method to extract natural water system in DEM [Martz L W, Garbrecht J. (1992) Numerical definition of ...

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Problems solved by technology

[0005] The purpose of the present invention is to utilize a kind of method that extracts geomorphic line automatically according to vector contour data, aims to solve and utilize the extraction ridge line valley line based on rule DEM data, in the DEM data conversion process of vector contour data and rule A lot of terrain feature information will be lost, which makes the extracted information such as ridge lines and valley lines quite different from the actual terrain.

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