The effect of short ground vegetation on terrestrial laser scans at a local scale
The effect of short ground vegetation on terrestrial laser scans at a local scale
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DOI：
10.1016/j.isprsjprs.2014.06.003
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发表时间：
2014-09-01
影响因子：
12.7
通讯作者：
Einstein, Herbert
中科院分区：
文献类型：
--
作者：
Fan, Lei;Powrie, William;Einstein, Herbert
地面激光扫描（TLS）可以在相对较短的时间内记录大量精确的地形信息，具有较高的空间精度。这些特点表明，它是一个有用的工具，地形测量和地表变形检测。然而，使用TLS来测量地形表面在存在密集地面植被的情况下仍然具有挑战性。由于植被造成的信号遮挡，裸露的地面可能无法照明。本文研究了在局部尺度上TLS调查中植被引起的高程误差及其空间分布。一个开放的，相对平坦的地区植被茂密的草进行了多次调查，在几个扫描条件。全站仪被用来建立一个精确的表示裸露的地面。局部最高点和局部最低点滤波器被应用到获取的点云，分别用于推导植被高度和植被引起的高程误差。讨论了植被高度、边缘效应、入射角、扫描分辨率和位置等因素对测量误差的影响。结果是使用的规划和解释TLS调查的植被覆盖区。(C)2014年国际摄影测量与遥感学会（摄影测量和遥感学会）。Elsevier B.V.出版，保留所有权利。
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. (C) 2014 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS). Published by Elsevier B.V. All rights reserved.