基于栅格数字高程模型自动提取黄土地貌沟沿线技术研究

STUDY OF AUTOMATED EXTRACTION OF SHOULDER LINE OF VALLEY FROM GRID DIGITAL ELEVATION DATA

从数字高程模型(DEM)中提取具有精确定位特征的连续的沟沿线是构建黄土沟壑丘陵地区土壤侵蚀、泥沙搬运和径流过程的空间分布式机理一过程模型的关键技术.本文提出了基于地貌形态学特征的地貌提取技术,在提取具有代表性的黄土丘陵沟壑区山西离石王家沟流域汇流网络的基础上,自动提取了该流域完整的沟沿线,得到了满意的结果.

The extraction of continuous shoulder line of valley having precise location is the key technique to the construction of spatial distribution mechanism-course models such as soil erosion, sediment transportation and runoff course in gully area in the Loess Plateau. The extraction technique presented in this paper is a morphologically based method utilizing finite morphologic elements to define the topographical structure. In this paper, the authors present an algorithm by which the drainage network and the continuous shoulder line of valley is extracted automatically from the DEM of Wangjiagou in Lishi, Shanxi, which is located in gully area in the Loess Plateau, and the final result is in accordance with the real condition of the experiment area.