摘要
针对传统的流域划分方法往往包含面积过小或过大的流域单元,无法顾及治理的可行性及有效性,难以满足实际应用需求的问题,该文以流域单元为主要研究对象,利用数字高程模型提出了一种基于面积约束的自适应流域划分方法;该方法对面积大于50 km^(2)的流域,以面积等分及划分次数最少为优化目标,将流域划分为若干个符合面积要求的流域;对面积小于5 km^(2)的流域,则与其上游流域进行归并。基于流域单元面积约束提取方法的实验结果表明,该方法在不破坏流域归属属性的情况下,使所有流域的面积均符合要求,提高了流域信息的实用性,为山区、丘陵地形为主区域的空间治理单元自动划分提出一种解决路径。
Aiming at the problem of undersized or oversized watersheds extracted by traditional watershed division methods,which failed to take into account the feasibility and effectiveness of governance,and failed to meet the actual application needs,this paper took the watershed as the main research object,and proposed an adaptive watershed division method based on area constraints by using digital elevation model.For watersheds with the area more than 50 km^(2),these watersheds were divided into several watersheds which met the area requirements with the optimization objective of equal area division and minimum division times.For watersheds with the area less than 5 km^(2),these watersheds were merged with the upstream ones.The experimental results proved that using the area constraint extraction method,the area of all watersheds met the requirements without destroying the attribution of watersheds.The method could improve the practicability of watershed information,and could propose a solution for the automatic division of spatial governance units in mountainous and hilly areas.
作者
俞春娜
冯存均
YU Chunna;FENG Cunjun(Zhejiang Academy of Surveying and Mapping,Hangzhou 311100,China)
出处
《测绘科学》
CSCD
北大核心
2022年第12期216-222,共7页
Science of Surveying and Mapping
基金
国家重点研发计划项目(2016YFC0803106)
关键词
自然资源
数字高程模型
小流域
面积约束
合并
自适应分割
natural resources
digital elevation model
small watershed
area constraint
merge
self-adaptive threshold segmentation
作者简介
俞春娜(1986—),女,浙江宁波人,工程师,硕士研究生,主要研究方向为地理信息技术应用、行业发展战略。E-mail:zjuyuchunna@126.com;通信作者:冯存均,教授,E-mail:jack9094@sina.com
