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Estimation of tree Stem attributes using terrestrial photogrammetry with a camera rig

Forsman, Mona and Börlin, Niclas and Holmgren, Johan (2016). Estimation of tree Stem attributes using terrestrial photogrammetry with a camera rig. Forests. 7:3, 1-20
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Official URL: http://dx.doi.org/10.3390/f7030061

Abstract

We propose a novel photogrammetric method for field plot inventory, designed for simplicity and time efficiency on-site. A prototype multi-camera rig was used to acquire images from field plot centers in multiple directions. The acquisition time on-site was less than two minutes. From each view, a point cloud was generated using a novel, rig-based matching of detected SIFT keypoints. Stems were detected in the merged point cloud, and their positions and diameters were estimated. The method was evaluated on 25 hemi-boreal forest plots of a 10-m radius. Due to difficult lighting conditions and faulty hardware, imagery from only six field plots was processed. The method performed best on three plots with clearly visible stems with a 76% detection rate and 0% commission. Diameters could be estimated for 40% of the stems with an RMSE of 2.8-9.5 cm. The results are comparable to other camera-based methods evaluated in a similar manner. The results are inferior to TLS-based methods. However, our method is easily extended to multiple station image schemas, something that could significantly improve the results while retaining low commission errors and time on-site. Furthermore, with smaller hardware, we believe this could be a useful technique for measuring stem attributes in the forest.

Authors/Creators:Forsman, Mona and Börlin, Niclas and Holmgren, Johan
Title:Estimation of tree Stem attributes using terrestrial photogrammetry with a camera rig
Series/Journal:Forests (1999-4907)
Year of publishing :8 March 2016
Volume:7
Number:3
Page range:1-20
Number of Pages:20
Publisher:MDPI
ISSN:1999-4907
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:K Forestry > K01 Forestry - General aspects
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 1 Natural sciences > 102 Computer and Information Science > Computer Vision and Robotics (Autonomous Systems)
(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 207 Environmental Engineering > Remote Sensing
Agrovoc terms:trees, stems, forest inventories, photogrammetry, methods
Keywords:mobile mapping, stem diameter, circle estimation, forest inventory, point cloud
URN:NBN:urn:nbn:se:slu:epsilon-e-3576
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3576
Additional ID:
Type of IDID
Web of Science (WoS)000373700800021
DOI10.3390/f7030061
ID Code:13540
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
Deposited By: SLUpub Connector
Deposited On:03 Aug 2016 06:59
Metadata Last Modified:03 Aug 2016 06:59

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