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标题

DEM水平分辨率越高,提取的河长越准确?

作者

刘凡; 陈波; 史培军

机构

北京师范大学民政部/教育部减灾与应急管理研究院; 北京师范大学地表过程与资源生态国家重点实验室; 北京师范大学环境演变与自然灾害教育部重点实验室

摘要

是否所使用的DEM水平分辨率越高,水文、水力学模拟的准确度和流域特征参数提取的精度越高?为探讨该问题,本文用Arc-Hydro模块提取了9种DEM水平分辨率下(3~250米)202条不同等级(Strahler Order)河流的河长,以3米激光探测与测距(LiDAR)DEM数字化的河长为标准,计算了各分辨率下河长提取的平均相对误差(ARE)。结果表明:在本文研究区内,10~20米水平分辨率的DEM数据提取的河流长度最为精确;随着DEM水平分辨率的提高,不同等级河流提取河长的ARE均逐渐减小;当水平分辨率提高到一定级别之后若继续提高时,ARE反而会逐渐增大;即整体上提取河长的平均相对误差和DEM水平分辨率之间呈“对勾型”变化规律。本研究表明,并不是DEM水平分辨率越高,提取河长越精确。

关键词

数字高程模型(DEM); 水平分辨率; 流域特征参数; 河长

引用

马美红; 张书函; 王会肖; 杨会彩; 李青. 非饱和土壤水分运动参数的确定-以昆明红壤土为例.[J]. 北京师范大学学报(自然科学版),2016,52(5)610-615.

基金

国家自然科学基金创新研究群体资助项目(41321001) ;相邻小流域降水径流过程的空间变异性研究资助项目(2014NT13)

分类号

P33

DOI

10.16360/j.cnki.jbnuns.2016.05.013

Title

The Finer the DEM Resolution, the More Accurate the Extracted River Length?

Author

LIU Fan; CHEN Bo; SHI Peijun

Affiliations

Academy of Disaster Reduction and Emergency Management, Ministry of Civil Affairs & Ministry of Education; State Key Laboratory of Earth Surface Processes and Resource Ecology; Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education, Beijing Normal University

Abstract

The horizontal resolution of digital elevation model (DEM) determines degree to which spatial heterogeneity of terrain features can be captured, thus significantly affects accuracy of hydrological and hydraulic simulations and derivation of watershed characteristics. Is there an optimal horizontal resolution of DEM to maximize accuracy of model simulation and watershed characteristic parameters derivation? To explore this problem, length of 202 rivers with different Strahler orders were derived from DEM of nine resolutions using Arc-hydro module. We also digitized these rivers based on 3m LiDAR DEM and calculated average of relative error (ARE) of derived river lengths. ARE value of extracted river length was found to first decrease then increase with increasing horizontal DEM resolution. This study challenges the hypothesis that the finer the DEM resolution, the more accurate the extracted river length.

Key words

digital elevation model; horizontal resolution; watershed characteristic parameters; river length

cite

LIU Fan; CHEN Bo; SHI Peijun. The Finer the DEM Resolution, the More Accurate the Extracted River Length? [J]. Journal of Beijing Normal University (Natural Science), 2016,52(5):610-615.

DOI

10.16360/j.cnki.jbnuns.2016.05.013

Copyright © 2014 Journal of Beijing Normal University (Natural Science)
Designed by Mr. Sun Chumin. Email: cmsun@mail.bnu.edu.cn