| 提取山脊线和山谷线的一种新方法 |
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| 引用本文： | 黄培之.提取山脊线和山谷线的一种新方法[J].武汉大学学报(信息科学版),2001,26(3). |
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| 作者姓名： | 黄培之 |
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| 作者单位： | 深圳大学信息工程学院, |
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| 摘 要： | 在研究了现有的仅从山脊线和山谷线的几何特性或物理特性的单一方面设计的提取山脊线和山谷线的算法后 ,提出了一种基于地形表面流水分析与等高线几何分析相结合的提取山脊线和山谷线的方法。该方法把等高线几何分析的方法与地形表面流水模拟分析的方法有机地结合起来 ,能够克服各自所具有的弊端。实验结果表明 ,用本文方法所提取的山脊线和山谷线与实际地形相符合。
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| 关 键 词： | 山脊线 几何分析 流水分析 特征点 |
A New Method for Extracting Terrain Feature Lines from Digitized Terrain Data |
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| HUANG Peizhi.A New Method for Extracting Terrain Feature Lines from Digitized Terrain Data[J].Geomatics and Information Science of Wuhan University,2001,26(3). |
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| Authors: | HUANG Peizhi |
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| Institution: | HUANG Peizhi 1 |
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| Abstract: | Ridge and valley are of essential important feature of terrain surface.They play an important role in the terrain representation because the basic structure of terrain is determined by these terrain feature.Digitized contour data contains the information of these feature lines implicitly.For many years,researchers have been working on the extraction of terrain feature lines from digitized contour lines.Up to now,existing method for feature line extraction is 2D geometrical analysis method,which includes extraction of feature points and feature line tracing.The former can be well solved by 2D geometrical analysis,but the latter is very difficult and remains unsolved because of the limitation of 2D geometrical analysis. In this paper,the author investigates the problem of the derivation of terrain feature lines,and discusses the existing method for the derivation of terrain feature line.After analyzing the existing method theoretically,the author puts forward an idea for terrain feature line tracing in which 3D terrain analysis technique is used.The new idea is based on the fact that vellay line is the line into which falling water is merged and ridge line is the line which separates falling water. The method for terrain feature line tracing developed by the new idea includes 3D terrain analysis and 2D geometrical analysis.Because 3D terrain analysis means falling water analysis in this paper,it is also called physical analysis of terrain model.In the falling water analysis of terrain,the lines into which falling water is merged and the line which separates falling water can be roughly located by falling water simulation.Because the conception of valley line and ridge line differs from the conception of the lines into slightly,some adjustment must be done before the valley line and ridge line are determined.The adjustment includes that some problems are led by differences between conceptions,and the location is not accurate by falling water simulation.The former means that there exist some mistakes at the two ends of the line into which falling water is merged because the accumulation of falling water has close relation to elevation.It leads to some part of valley line at higher position loss because the accumulation of falling water is small,and some part of the line into which falling water is merged at lower position is taken as parts of valley line because the accumulation of falling water is larger.The latter is led by the lower accuration of the data used in 3D terrain analysis.In the new method,2D geometrical analysis technique is combined with 3D terrain analysis,and the rough results of falling water simulation are used to guide the selection and ordering of feature points from 2D geometrical analysis results.In this way,the new mathod can take the advantages of 2D geometrical analysis and 3D terrain analysis,and overcome the shortcomings of them.At the end of this paper,the author gives an experimental result which shows the valley and ridge extracted by the new method is concord to the experimental terrain. |
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| Keywords: | feature line geometric analysis falling water simulations dominant point |
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