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Open AccessArticle

Comparison and Combination of Mobile and Terrestrial Laser Scanning for Natural Forest Inventories

1
Institute of Photogrammetry and Remote Sensing, Technische Universität Dresden, D-01062 Dresden, Germany
2
Institute of General Ecology and Environmental Protection, Technische Universität Dresden, D-01735 Tharandt, Germany
*
Author to whom correspondence should be addressed.
Forests 2018, 9(7), 395; https://doi.org/10.3390/f9070395
Received: 20 June 2018 / Revised: 28 June 2018 / Accepted: 29 June 2018 / Published: 4 July 2018
(This article belongs to the Special Issue Terrestrial and Mobile Laser Scanning in Forestry)
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. View Full-Text
Keywords: forest inventory parameters; quantitative structure models; wood volume; diameter at breast height; crown projection area forest inventory parameters; quantitative structure models; wood volume; diameter at breast height; crown projection area
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MDPI and ACS Style

Bienert, A.; Georgi, L.; Kunz, M.; Maas, H.-G.; Von Oheimb, G. Comparison and Combination of Mobile and Terrestrial Laser Scanning for Natural Forest Inventories. Forests 2018, 9, 395.

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