Assessing the Effects of Sample Size on Parametrizing a Taper Curve Equation and the Resultant Stem-Volume Estimates

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Saarinen , N , Kankare , V , Pyorala , J , Yrttimaa , T , Liang , X , Wulder , M A , Holopainen , M , Hyyppa , J & Vastaranta , M 2019 , ' Assessing the Effects of Sample Size on Parametrizing a Taper Curve Equation and the Resultant Stem-Volume Estimates ' , Forests , vol. 10 , no. 10 , 848 . https://doi.org/10.3390/f10100848

Title: Assessing the Effects of Sample Size on Parametrizing a Taper Curve Equation and the Resultant Stem-Volume Estimates
Author: Saarinen, Ninni; Kankare, Ville; Pyorala, Jiri; Yrttimaa, Tuomas; Liang, Xinlian; Wulder, Michael A.; Holopainen, Markus; Hyyppa, Juha; Vastaranta, Mikko
Contributor: University of Helsinki, Forest Health Group
University of Helsinki, Forest Health Group
University of Helsinki, Department of Forest Sciences
University of Helsinki, Laboratory of Forest Resources Management and Geo-information Science
University of Helsinki, Department of Forest Sciences
University of Helsinki, University of Eastern Finland
Date: 2019-10
Language: eng
Number of pages: 19
Belongs to series: Forests
ISSN: 1999-4907
URI: http://hdl.handle.net/10138/308129
Abstract: Large and comprehensive datasets, traditionally based on destructive stem analysis or other labor-intensive approaches, are commonly considered as a necessity in developing stem-volume equations. The aim here was to investigate how a decreasing number of sample trees affects parametrizing an existing taper curve equation and resultant stem-volume estimates. Furthermore, the potential of terrestrial laser scanning (TLS) in producing taper curves was examined. A TLS-based taper curve was derived for 246 Scots pines (Pinus sylvestris L.) from southern Finland to parametrize an existing taper curve equation. To assess sensitivity of the parametrization regarding sample size, the number of Scots pines included in the parametrization varied between full census and 1 Scots pine at a time. Root mean square error of stem-volume estimates remained = 46 Scots pines. Thus, it can be concluded that, with a rather small sample size, a taper curve equation can be re-parametrized for local conditions using point clouds from TLS to produce consistent stem-volume estimates.
Subject: 4112 Forestry
ground-based LiDAR
terrestrial laser scanning
TLS
volume modelling
forest sciences
BIOMASS EXPANSION FACTORS
TREE BIOMASS
NORWAY SPRUCE
SCOTS PINE
LASER
CARBON
FORESTS
RECONSTRUCTION
PERFORMANCE
INVENTORY
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