摘要
针对数字高程模型(DEM)的水平分辨率会影响滑坡灾害分析中斜坡单元的提取结果的问题,该文以云南省昆明市东川区蒋家沟流域为研究区,利用斜坡单元提取模型MIA-HSU分析蒋家沟流域在不同水平分辨率DEM条件下的斜坡单元提取结果的差异性。以蒋家沟流域1 m分辨率DEM提取的斜坡单元和坡度值为参考,选取斜坡单元平均坡度误差和斜坡单元内部坡度均一性等判定标准,评价DEM水平分辨率对斜坡单元提取结果的影响。研究表明随着DEM水平分辨率的降低,提取的斜坡单元与基于1 m分辨率DEM提取的斜坡单元相比,平均坡度误差增加,单元内部坡度均一性降低。但是考虑各指标变化速率,DEM数据的可获得性与成本和研究区内滑坡与斜坡单元叠加分析结果,最终在给出各项判定指标的误差在可接受的范围内的基础上,该文推荐12.5 m分辨率的DEM用于提取蒋家沟的斜坡单元最佳。
In response to the issue that the horizontal resolution of digital elevation model(DEM)affects the extraction results of slope units in landslide hazard analysis, this article takes the Jiangjiagou watershed in Dongchuan District, Kunming City, Yunnan Province as the research area, and uses the slope unit extraction model MIA-HSU to analyze the differences in the extraction results of slope units in the Jiangjiagou watershed under different horizontal resolution DEM conditions. Taking the slope unit extracted by a 1 m resolution DEM and slope as references, the influence of DEM horizontal resolution on slope unit extraction results is evaluated through criteria such as average slope error of slope unit, and internal slope uniformity of slope unit. The study shows that with the decrease in DEM horizontal resolution, compared with the slope units extracted by a 1 m resolution DEM,although the average slope error increases, and the internal slope uniformity decreases. However, considering the change rate of each index, the availability and cost of DEM data, and the superposition analysis results of landslide and slope units in the study area, and finally giving that the error of each judgment index is within an acceptable range, this study recommends that DEM with 12.5 m resolution is the best for extracting slope units in Jiangjiagou.
作者
王秀英
张少杰
王凯
杨红娟
WANG Xiuying;ZHANG Shaojie;WANG Kai;YANG Hongjuan(State Key Laboratory of Mountain Hazards and Engineering Safety,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610299,China;College of Software Engineering,Chengdu University of Information Technology,Chengdu 610225,China;Institute of Civil Engineering,Zhongyuan University of Technology,Zhengzhou 450007,China)
出处
《测绘科学》
CSCD
北大核心
2024年第6期65-73,共9页
Science of Surveying and Mapping
基金
国家重点研发计划项目(2023YFC3007202)
中国气象局气象能力提升联合研究专项(23NLTSZ009)。
