黄土丘陵沟壑区沟谷网络自动制图技术研究.doc.doc

黄土丘陵沟壑区沟谷网络自动制图技术研究*
闾国年钱亚东陈钟明
(南京师范大学地理科学学院,南京,210097)
STUDY OF AUTOMATED MAPPING OF WORK IN
HILLY LOESS REGION
Lu Guonian, Qian Yadong, Chen Zhongming
(The College of Geography Science, Nanjing Normal University, Nanjing,210097)
Abstract The key technique of mapping of work in hilly loess region is the automated extraction technique of the work. Considering the difference of work and work, the authors developed a method described in this paper that bined of hydrologically-based method and morphologically-based method, which have been improved. In this paper, the authors present an algorithm by which the work is extracted automatically form the grid DEM of Wangjiagou in Lishi, Shanxi, where is located in typical hilly loess region in loess plateau, and the final results is in accordance with the real condition of the experiment area. 网
Keywords Hilly loess region in Loess Plateau, work, work, Shoulder line of valley, Digital Elevation Model (DEM)
摘要黄土丘陵沟壑区沟谷网络自动制图技术的核心是沟谷网络的自动提取技术。本文基于沟谷网络和汇流网络的差别,提出了形态学方法和水文学方法相结合自动提取沟谷网络的新技术,设计了完整的基于栅格数字高程数据的提取算法,并给出了典型黄土沟壑丘陵区山西离石王家沟小流域的运行结果。提取得到的沟谷网络与实际情况相符。
关键词黄土沟壑丘陵区沟谷网络汇流网络沟沿线数字高程模型
分类号 网
1 引言网
黄土高原丘陵沟壑区侵蚀切割严重,沟谷系统非常发育。沟谷网络作为沟谷系统的基本要素,可以派生出许多反映沟谷系统空间特征的参数,同时沟谷网络图也是地貌制图的基础。过去采用目视解译的方法从地形图或航片上提取沟谷网络,然后制作沟谷网络图和地貌图,速度慢,效率低,无法获取现势性很好的沟谷网络以反映沟谷系统动态变化。因此,基于当代先进的遥感对地观测技术和地理信息系统技术,发展沟谷网络的自动提取技术,计算各种沟谷地貌参数,进而制作沟谷网络图和地貌图,以满足定位