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

doi:10.3390/ijgi10010028

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 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 Lal 1,2; Zhao, Wei 2,3; Chaudhary, Suresh 3; Xiong, Donghong 2,3; Wu, Yanhong 2,3
刊名	ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION
	2021
卷号	10 期号:1 页码:28
关键词	digital elevation model soil erosion topographic factors RUSLE unmanned aerial vehicle
DOI	10.3390/ijgi10010028
通讯作者	Zhao, Wei(zhaow@imde.ac.cn)
产权排序	3
文献子类	Article
英文摘要	Soil 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.
电子版国际标准刊号	2220-9964
资助项目	External 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研究方向	Physical Geography ; Remote Sensing
语种	英语
出版者	MDPI
WOS记录号	WOS:000610269100001
资助机构	External 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
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/55246]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室成都山地灾害与环境研究所_山地灾害与地表过程重点实验室成都山地灾害与环境研究所_数字山地与遥感应用中心
通讯作者	Zhao, Wei
作者单位	1.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
推荐引用方式 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.