规则高程格网中完整性谷地线提取.pdf

Abstract Valley lines are abstract representation of terrain and play important roles in various application, such as in the area of hydrology, biology and geomorphometry. The automatic extraction of valley line has been an active research topic for a long time. According to the data sources used, existing methods can be classified into three categories, which are those based on contour, based on TIN and based on grid matrix. Due to the fast development of InSAR and LIDAR technology, high quality grid elevation data is widely available in present days. However, there is not a method which can extract complete valley lines from the grid elevation matrix. And there are not effective methods for reducing the process of noise in valley line. This paper designs a novel model based on analysis of terrain characteristics of valley lines. The primary valley lines are extracted based on water accumulation algorithm in first stage. Then the local morphometry is investigated to append eligible terrain specific point. The third step considers the reduction of noises in the result. Based on the inductive analysis, the noises are classified into different types and handled according to the context. Discuss