SUN Huan, WANG Ranghu, YANG Jiuchun, et al. Influence of Different Illumination Conditions on 3D Reconstruction Accuracy of Erosion Gully[J]. 2023, 37(1): 45-51.
DOI:
SUN Huan, WANG Ranghu, YANG Jiuchun, et al. Influence of Different Illumination Conditions on 3D Reconstruction Accuracy of Erosion Gully[J]. 2023, 37(1): 45-51. DOI: 10.13870/j.cnki.stbcxb.2023.01.007.
Influence of Different Illumination Conditions on 3D Reconstruction Accuracy of Erosion Gully
In order to further explore the differences in accuracy of UAV-derived 3D models under different lighting conditions
four phases of digital surface models were constructed by UAV photography technology under sunny and cloudy conditions
and elevation points measured by RTK (real-time kinematic) and digital elevation model obtained by 3D laser scanner were taken as benchmark
respectively. At the typical section and the entire erosion gully scale
the difference in elevation accuracy of 3D reconstruction of erosion gully under different lighting conditions was analyzed. The results showed that: (1) At the typical section scale
the elevation accuracy of the model constructed on cloudy days was the highest
and the elevation accuracy of the model constructed at noon on sunny days was higher than that in the morning and afternoon
while the elevation error of the shaded area was 0.138~0.217 m higher than that in the non-shaded area. (2) At the entire erosion gully scale
the root mean square error of the aerial survey elevation model on cloudy days was only 0.155 m
which was the minimum. For different periods of sunny days
the elevation error of DSM obtained by UAV survey at noon was the lowest
but it was still 0.411 m higher than that of DSM on cloudy days. Based on the three elevation models of sunny days
the elevation error in the shaded area was 0.250~0.346 m higher than that in the non-shaded area. (3) From different slope aspects
the elevation error of sunny slope was the lowest
while the increasing of shadow area led to the further increase of other slope aspects errors. The results showed that the shadow caused by illumination significantly reduced the accuracy of the elevation model
which could provide a reference for the research of aerial mapping of erosion gully based on UAV.
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Related Author
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TIAN Pei
ZHAO Min
SUN Yarong
CHEN Yunming
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PEI Zhilin
Related Institution
College of Urban and Environmental Sciences, Key Laboratory for Geographical Process Analysis & Simulation Hubei Province, Central China Normal University
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling
Institute of Soil and Water Conservation, CAS&MWR, Yangling
Research Center of Soil and Water Conservation and Ecological Environment, CAS and Ministry of Education, Yangling