首页|A DEM upscaling method with integrating valley lines based on HASM

A DEM upscaling method with integrating valley lines based on HASM

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A new digital elevation model(DEM)upscaling method based on high accuracy surface modeling(HASM)is proposed by combining the elevation information of DEM and the valley lines extracted from DEM with different flow accumulation thresholds.The proposed method has several advantages over traditional DEM upscaling methods.First,the HASM ensures the smoothness of the upscaled DEM.Secondly,several DEMs with different topographic details can be obtained using the same DEM grid size by incorporating the valley lines with different flow accumulation thresholds.The Jiuyuangou watershed in China's Loess Plateau was used as a case study.A DEM with a grid size of 5 m obtained from the local surveying and mapping department was used to verify the proposed DEM upscaling method.We established the surface complexity index to describe the complexity of the topographic surface and quantified the differences in the topographic features obtained from different upscaling results.The results show that topography becomes more generalized as grid size and flow accumulation threshold increase.At a large DEM grid size,an increase in the flow accumulation threshold increases the difference in elevation values in different grids,increasing the surface complexity index.This study provides a new DEM upscaling method suitable for quantifying topography.

DEMupscalingHASMflow accumulation thresholdsurface complexity index

Mingwei ZHAO、Xiaoxiao JU、Na ZHAO、Chun WANG、Yan XU、Xiaoran WU、Weitao LI

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Geographic Information and Tourism College,Chuzhou University,Chuzhou 239000,China

Anhui Engineering Laboratory of Geo-information Smart Sensing and Services,Chuzhou 239000,China

Anhui Center for Collaborative Innovation in Geographical Information Integration and Application,Chuzhou 239000,China

School of Geographic Information and Tourism,Chuzhou University,Chuzhou 239000,China

College of Resource,Environment and Tourism,Capital Normal University,Beijing 100048,China

State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China

College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100101,China

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Anhui Province Universities Outstanding Talented Person Support ProjectMajor Project of Natural Science Research of Anhui Provincial Department of EducationMajor Project of Natural Science Research of Anhui Provincial Department of EducationMajor Project of Natural Science Research of Anhui Provincial Department of EducationNational Natural Science Foundation of Chinaguiding plan project of Chuzhou Science and Technology Bureau"113"Industry Innovation Team of Chuzhou City in Anhui Province

gxyq20220972022AH040150KJ2021ZD0130KJ2021ZD0131420713742021ZD008

2024

10.1007/s11707-022-1068-0

地球科学前沿
高等教育出版社

地球科学前沿

CSTPCD
影响因子：0.585
ISSN：2095-0195
年,卷(期)：2024.18(3)
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