摘要
集水面积阈值的确定是基于数字高程模型提取水系过程中的关键环节,但目前集水面积阈值的确定存在着随意性和主观性。本文引入分维数量化集水面积阈值对水系提取的影响。研究表明,在给定标度区间内集水面积阈值和分维数存在着良好的回归关系。二者的拟合方程可用来进行集水面积阈值的合理确定和水系的准确提取。
The determination of catchment area threshold is of great importance in the algorithm for delineation of a drainage network. Based on different catchment area threshold, drainage network is extracted at different river system structure and different fractal dimensions. The goal of this paper is to find in what extend the threshold may influence the fractal dimension of the drainage. And through the grid fractal method, a fitted equation was proposed from the value of thresholds and fractal dimensions. There were strong relativities about the change between them. By the equation, the catchment area threshold could be determined from the fractal dimension of the natural drainage.
出处
《测绘科学》
CSCD
北大核心
2011年第4期33-34,共2页
Science of Surveying and Mapping
基金
福建省自然科学基金项目(2009J01214)
福建省教育厅科技项目(JA09028)
中科院资源与环境信息系统国家重点实验室开放研究基金课题(A0711)
AMD合作项目奖励基金
国家自然科学基金(41001254)
国家自然科学基金重点项目(40930531)
关键词
DEM
集水面积阈值
分形分维
流域
DEM
catchment area threshold
fractal dimension
watershed
