Comparison and Combination of Mobile and Terrestrial Laser Scanning for Natural Forest Inventories
Comparison and Combination of Mobile and Terrestrial Laser Scanning for Natural Forest Inventories
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DOI：
10.3390/f9070395
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发表时间：
2018-07-01
期刊：
影响因子：
2.9
通讯作者：
von Oheimb, Goddert
中科院分区：
文献类型：
--
作者：
Bienert, Anne;Georgi, Louis;von Oheimb, Goddert
近二十年来，地面激光扫描（TLS）已成功用于森林三维（3D）数据捕获。除了TLS的基于绘图的数据捕获能力之外，基于车辆的移动的激光扫描（MLS）系统具有快速和精确的类似走廊的3D数据捕获的明显优势，从而在更短的采集时间内提供更大的覆盖范围。本文比较和讨论的优点和缺点相比，建立TLS数据记录计划的多时相MLS数据采集。在森林中综合TLS和MLS数据处理的这项试点研究中，可以表明，现有的TLS数据评估程序可以用于MLS数据处理。使用两种扫描方法和不同季节的数据，在两个样地中测试了用于森林清查参数确定和数量结构模型（QSM）生成的自动激光扫描仪数据处理方法。多扫描配置中的TLS可提供非常高密度的3D点云，这为生成高质量QSM提供了宝贵的基础。试点研究表明，MLS是能够提供高质量的数据，相当于确定相关的森林资源清查参数相比，TLS。可以从MLS数据确定诸如树位置、胸高直径（DBH）或树高的参数，其精度类似于从TLS数据导出的参数的精度。结果，例如，在胸径测定圆柱拟合产生的标准偏差为1.1厘米的树木在TLS数据和3.7厘米的MLS数据。然而，发现MLS扫描的分辨率不足以成功生成QSM。此外，森林中微波着陆系统数据的登记还需要在考虑全球导航卫星系统信号差造成的影响方面作出更多努力。
Terrestrial laser scanning (TLS) has been successfully used for three-dimensional (3D) data capture in forests for almost two decades. Beyond the plot-based data capturing capabilities of TLS, vehicle-based mobile laser scanning (MLS) systems have the clear advantage of fast and precise corridor-like 3D data capture, thus providing a much larger coverage within shorter acquisition time. This paper compares and discusses advantages and disadvantages of multi-temporal MLS data acquisition compared to established TLS data recording schemes. In this pilot study on integrated TLS and MLS data processing in a forest, it could be shown that existing TLS data evaluation routines can be used for MLS data processing. Methods of automatic laser scanner data processing for forest inventory parameter determination and quantitative structure model (QSM) generation were tested in two sample plots using data from both scanning methods and from different seasons. TLS in a multi-scan configuration delivers very high-density 3D point clouds, which form a valuable basis for generating high-quality QSMs. The pilot study shows that MLS is able to provide high-quality data for an equivalent determination of relevant forest inventory parameters compared to TLS. Parameters such as tree position, diameter at breast height (DBH) or tree height can be determined from MLS data with an accuracy similar to the accuracy of the parameter derived from TLS data. Results for instance in DBH determination by cylinder fitting yielded a standard deviation of 1.1 cm for trees in TLS data and 3.7 cm in MLS data. However, the resolution of MLS scans was found insufficient for successful QSM generation. The registration of MLS data in forests furthermore requires additional effort in considering effects caused by poor GNSS signal.