The effect of short ground vegetation on terrestrial laser scans at a local scale |
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| Institution: | 1. Soil Geography and Landscape Group, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands;2. Hydrology and Quantitative Water Management Group, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands;3. Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO, United States;1. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University. 129 Luoyu Road 4730079, China;2. CAS Key Laboratory of Spectral Imaging Technology, Xi''an, 710119, China.;3. Electronic Information School, Wuhan University, 299 Bayi Road, 4730072, China;4. School of Remote Sensing and Information Engineering, Wuhan University, 129 Luoyu Road, 4730079, China;1. School of Nano and Advanced Materials Science & Engineering, and LINC, Gyeongsang National University, 900 Gajwa-dong, Jinju, Gyeongnam 660-701, Republic of Korea;2. School of Mechanical and Aerospace Engineering, Gyeongsang National University, 900 Gajwa-dong, Jinju, Gyeongnam 660-701, Republic of Korea;3. School of Power and Energy, Northwestern Polytechnical University, Xi''an 710072, China;4. Agency for Defense Development, Yuseong, P.O. Box 35-4, Daejeon 305-600, Republic of Korea;5. Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea |
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| Abstract: | Terrestrial laser scanning (TLS) can record a large amount of accurate topographical information with a high spatial accuracy over a relatively short period of time. These features suggest it is a useful tool for topographical survey and surface deformation detection. However, the use of TLS to survey a terrain surface is still challenging in the presence of dense ground vegetation. The bare ground surface may not be illuminated due to signal occlusion caused by vegetation. This paper investigates vegetation-induced elevation error in TLS surveys at a local scale and its spatial pattern. An open, relatively flat area vegetated with dense grass was surveyed repeatedly under several scan conditions. A total station was used to establish an accurate representation of the bare ground surface. Local-highest-point and local-lowest-point filters were applied to the point clouds acquired for deriving vegetation height and vegetation-induced elevation error, respectively. The effects of various factors (for example, vegetation height, edge effects, incidence angle, scan resolution and location) on the error caused by vegetation are discussed. The results are of use in the planning and interpretation of TLS surveys of vegetated areas. |
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| Keywords: | Terrestrial laser scanning (TLS) Vegetation Error DEM/DTM Point cloud Resolution |
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