摘要
流域数字水系网络提取的精度,通常与所使用的数字高程图(DEM)的精度和集水面积阈值的大小有关。在给定的DEM图上,数字水系的精度基本上取决于集水面积阈值的设置。首先介绍了几种确定阈值大小的方法,然后应用其中的"河网密度"法来对河套灌区的排干沟的水系网络进行提取。结果表明,该方法能很好地应用于灌区水系网络的合理提取。
The accuracy extraction of basins stream cision and the the threshold value of catchment area. ital stream digital network basically depends on how digital network usually is related to the DEM pre- In a givend DEM map, the precision of the dig- to set the threshold value of the catchment area.This paper first introduces several determine method of t the threshold value , then apply the ＂river network density＂ method to the extraction of drainage network for hetao irrigated area . The results show that the method can be used in reasonable network extraction for drainage network of irrigation.
出处
《水利科技与经济》
2012年第2期25-27,共3页
Water Conservancy Science and Technology and Economy
关键词
DEM
集水面积阈值
河套灌区
Threshold value of catchment
Hetao irrigated area
DEM
