Feature point extraction of ridge line and valley line from DEM based on falling vector

doi:10.13474/j.cnki.11-2246.2020.0310

Abstract

Abstract: In this paper, after studying the falling vector of terrain surface function, the falling vector characteristics of ridge point and valley point are derived by using the relevant mathematical principles according to the physical characteristics of the water separation of ridge line and confluence of valley line. A new method of extracting the feature points of ridge line and valley line based on falling vector is proposed after investigating into existing method. This method takes the minimum value of falling vector norm on the vertical section of falling vector as the criterion to determine the ridge point and valley point. The experiment shows that the selected points of ridge line and valley line extracted by this method are more accurate and reliable than the existing method.

Key words: ridge line, falling vector, extraction, minimum, feature point

CLC Number:

P237

HUANG Jiongyi, HUANG Peizhi, LI Jianqiang. Feature point extraction of ridge line and valley line from DEM based on falling vector[J]. Bulletin of Surveying and Mapping, 2020, 0(10): 12-15.

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