IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Sensitivity Assessment of Spatial Resolution Difference in DEM for Soil Erosion Estimation Based on UAV Observations: An Experiment on Agriculture Terraces in the Middle Hill of Nepal
Chidi, Chhabi Lal1,2; Zhao, Wei2,3; Chaudhary, Suresh3; Xiong, Donghong2,3; Wu, Yanhong2,3
Corresponding AuthorZhao, Wei(zhaow@imde.ac.cn)
2021
Source PublicationISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION
EISSN2220-9964
Volume10Issue:1Pages:28
SubtypeArticle
Contribution Rank3
AbstractSoil erosion in the agricultural area of a hill slope is a fundamental issue for crop productivity and environmental sustainability. Building terrace is a very popular way to control soil erosion, and accurate assessment of the soil erosion rate is important for sustainable agriculture and environmental management. Currently, many soil erosion estimations are mainly based on the freely available medium or coarse resolution digital elevation model (DEM) data that neglect micro topographic modification of the agriculture terraces. The development of unmanned aerial vehicle (UAV) technology enables the development of high-resolution (centimeter level) DEM to present accurate topographic features. To demonstrate the sensitivity of soil erosion estimates to DEM resolution at this high-resolution level, this study tries to evaluate soil erosion estimation in the Middle Hill agriculture terraces in Nepal based on UAV derived high-resolution (5 x 5 cm) DEM data and make a comparative study for the estimates by using the DEM data aggregated into different spatial resolutions (5 x 5 cm to 10 x 10 m). Firstly, slope gradient, slope length, and topographic factors were calculated at different resolutions. Then, the revised universal soil loss estimation (RUSLE) model was applied to estimate soil erosion rates with the derived LS factor at different resolutions. The results indicated that there was higher change rate in slope gradient, slope length, LS factor, and soil erosion rate when using DEM data with resolution from 5 x 5 cm to 2 x 2 m than using coarser DEM data. A power trend line was effectively used to present the relationship between soil erosion rate and DEM resolution. The findings indicated that soil erosion estimates are highly sensitive to DEM resolution (from 5 x 5 cm to 2 x 2 m), and the changes become relatively stable from 2 x 2 m. The use of DEM data with pixel size larger than 2 x 2 m cannot detect the micro topography. With the insights about the influencing mechanism of DEM resolution on soil erosion estimates, this study provides important suggestions for appropriate DEM data selection that should be investigated first for accurate soil erosion estimation.
Keyworddigital elevation model soil erosion topographic factors RUSLE unmanned aerial vehicle
DOI10.3390/ijgi10010028
Indexed BySCI
Language英语
Funding ProjectExternal Cooperation Program of BIC of Chinese Academy of Sciences ; National Natural Science Foundation of China[41771409] ; Sichuan Science and Technology Program[2020JDJQ0003] ; Kathmandu Center for Research and Education CAS-TU
WOS Research AreaPhysical Geography ; Remote Sensing
WOS SubjectGeography, Physical ; Remote Sensing
WOS IDWOS:000610269100001
Funding OrganizationExternal Cooperation Program of BIC of Chinese Academy of Sciences ; National Natural Science Foundation of China ; Sichuan Science and Technology Program ; Kathmandu Center for Research and Education CAS-TU
PublisherMDPI
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/55247
Collection山地表生过程与生态调控重点实验室
山地灾害与地表过程重点实验室
数字山地与遥感应用中心
Corresponding AuthorZhao, Wei
Affiliation1.Tribhuvan Univ, Cent Dept Geog, Kirtipur 44618, Nepal
2.Tribhuvan Univ, Chinese Acad Sci, Kathmandu Ctr Res & Educ, Branch Sustainable Mt Dev, Chengdu 610041, Peoples R China
3.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Chidi, Chhabi Lal,Zhao, Wei,Chaudhary, Suresh,et al. Sensitivity Assessment of Spatial Resolution Difference in DEM for Soil Erosion Estimation Based on UAV Observations: An Experiment on Agriculture Terraces in the Middle Hill of Nepal[J]. ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION,2021,10(1):28.
APA Chidi, Chhabi Lal,Zhao, Wei,Chaudhary, Suresh,Xiong, Donghong,&Wu, Yanhong.(2021).Sensitivity Assessment of Spatial Resolution Difference in DEM for Soil Erosion Estimation Based on UAV Observations: An Experiment on Agriculture Terraces in the Middle Hill of Nepal.ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION,10(1),28.
MLA Chidi, Chhabi Lal,et al."Sensitivity Assessment of Spatial Resolution Difference in DEM for Soil Erosion Estimation Based on UAV Observations: An Experiment on Agriculture Terraces in the Middle Hill of Nepal".ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION 10.1(2021):28.
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