摘要
从数字化地形资料中自动提取山脊线和山谷线的技术在测绘、工程设计等方面有着重要的意义。本文对现有的山脊线和山谷线自动提取的方法进行深入研究后 ,指出充分利用数据中所含有的地形信息是正确提取山脊线和山谷线的有效途径 ,那种试图仅依靠二维等高线形态分析的方法很难得到理想的结果。依照该思想本文设计出了一种基于DEM数据辅助的山脊线和山谷线提取方法。该方法先利用等高线数据建立区域地形概略DEM ,然后借助三维地形分析的技术辅助进行山脊线和山谷线的提取。文后通过实验验证了该方法的有效性 ,它所提取的山脊线和山谷线与实际地形相符合。
Skeleton lines are lines that indicate significant topographic features of the terrain. It is widely used in the field of surveying and mapping, topography representation and engineering designing. After investigating into the methods for derivation of skeleton line, authors conclude that it is very important to make fully use of data information in derivation of skeleton line, and put forward a new method for derivation of skeleton line with this view. In the new method, DEM is set up and used to get a rough set of skeleton lines. The rough skeleton lines are used to help to construct the ordering of feature points extracted from contour lines. Experimental result has proven the new method is quite effective and reliable in its identification of significant terrain features.
出处
《测绘科学》
CAS
CSCD
2003年第4期33-36,共4页
Science of Surveying and Mapping
关键词
山脊线
断面
地形分析
特征点
skeleton line
terrain feature
terrain analysis
feature points
