Deriving merchantable volume in poplar through non-destructive terrestrial laser scanning

SUN Yuan; LIANG Xinlian; LIANG Ziyu; LI Weizheng; WELHAM Clive

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Deriving merchantable volume in poplar through non-destructive terrestrial laser scanning

SUN Yuan 1 * #,LIANG Xinlian 2,LIANG Ziyu 1,LI Weizheng 3,WELHAM Clive 4

1.College of Forestry, Nanjing Forestry University, Nanjing, Jiangsu, China, 210037

2.Department of Remote Sensing and Photogrammetry, Finnish Geodetic Institute, Masala 02431, Finland

3.Advanced Analysis and Testing Center, Nanjing Forestry University, Nanjing, Jiangsu, China, 210037

4.Department of Forest Resources Management, Faculty of Forestry, University of British Columbia, 2045-2424 Main Mall, Vancouver, BC V6T 1Z4, Canada

*Correspondence author

#Submitted by

Subject:

Funding: doctoral program of higher education in China （No.20133204130001）

Opened online:25 April 2016

Accepted by: none

Citation: SUN Yuan,LIANG Xinlian,LIANG Ziyu.Deriving merchantable volume in poplar through non-destructive terrestrial laser scanning[OL]. [25 April 2016] http://en.paper.edu.cn/en_releasepaper/content/4684332

Timber volume is an important ecological component in forested landscapes. The application of Terrestrial Laser Scanning (TLS) to volume estimation has been widely accepted though few species have well-calibrated taper functions. This research uses TLS technology in poplar (Populus × canadensis Moench cv. 'I- 72/58') to extract stem diameter at different tree heights and establish the relationship between point cloud data and stem curve, which constitutes the basis for volume estimation of single trees and the stand. Eight plots were established and scanned by TLS. Stem curve functions were then fitted after extraction of diameters, DBH and tree heights from the point cloud data. Lastly, six functions were evaluated by R2 and RMSE. A modified Schumacher equation was the most suitable taper function. Volume estimates from the TLS-derived taper function were better than those derived using the stem-analysis data. Finally, regression analysis showed that predictions of stem size were similar when data were based on TLS versus stem analysis. Its high accuracy and efficiency indicates that TLS technology can play an important role in forest inventory assessment.

Keywords:TLS; taper function; stem curve; merchantable volume; point cloud; plot level

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