顾及爆燃地形特征的峡谷分级提取方法  

A method for extracting canyon grading considering the characteristics of deflagration terrain

作　　者：周访滨[1,2] 钟绍平 朱衍哲 杨自强 马国伟 ZHOU Fangbin;ZHONG Shaoping;ZHU Yanzhe;YANG Ziqiang;MA Guowei(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Special Environment Road Engineering of Hunan Province,Changsha University of Science&Technology,Changsha 410l14,China)

机构地区：[1]长沙理工大学交通运输工程学院,长沙410114 [2]长沙理工大学特殊环境道路工程湖南省重点实验室,长沙410114

出　　处：《测绘科学》2023年第9期89-98,共10页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41671446);湖南省自然科学基金项目(2021JJ30702);特殊环境道路工程湖南省重点实验室开放基金资助重点项目(kfj140502)。

摘　　要：针对现有爆燃地形中峡谷提取主观性强且未顾及爆燃地形特征的问题,该文提出了一种依据爆燃危险性程度分级的峡谷提取新方法。采用均值变点对峡谷密度进行分析,确定研究区峡谷及子流域最佳阈值,解决了峡谷提取过程中汇流栅格数目确定主观性强的问题。以Pearson相关性分析优选特征地形参数,结合爆燃危险性程度相关研究成果,实现了小起伏山地、中起伏山地、大起伏山地峡谷的分级提取。实验结果表明,最佳峡谷提取阈值随区域相对高差递增,分别为1800、2000、2200,子流域分割后峡谷特征因子量化计算便捷合理,大起伏山地区域峡谷具有更大的爆燃危险性。该方法客观有效,可为林区火灾消防提供技术支持和参考。In response to the problem of strong subjectivity in extracting canyons from existing deflagration terrain and not considering the characteristics of deflagration terrain,this paper proposes a new method for canyon extraction based on the classification of deflagration hazard level.The method of change-point in the mean was used to analyze the density of canyons and determine the optimal threshold for canyons and sub watersheds in the study area,solving the problem of strong subjectivity in determining the number of confluence grids in the process of canyon extraction.By using Pearson correlation analysis to select the optimal characteristic terrain parameters and combining with research results related to the degree of deflagration risk,the hierarchical extraction of small,medium,and large undulating mountain canyons was achieved.The experimental results show that the optimal threshold for extracting canyons increases with the relative height difference of the region,with values of 1800,2000,and 2200,respectively.After sub watershed segmentation,the quantification of canyon feature factors is convenient and reasonable,and canyons in mountainous areas with large undulations have a greater risk of deflagration.This method is objective and effective,and can provide technical support and reference for forest fire protection.

关 键 词：数字地形分析 栅格DEM 爆燃地形 峡谷 分级提取 

分 类 号：P217[天文地球—测绘科学与技术]