Comparison of selected splines for stem form modeling: A case study in Norway spruce

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41320%2F14%3A64996" target="_blank" >RIV/60460709:41320/14:64996 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Comparison of selected splines for stem form modeling: A case study in Norway spruce
Original language description
Natural cubic spline has been frequently used to represent stem forms, with other spline types rarely involved. Splines are a large class of functions and there are many other spline types which might serve that purpose. In this paper several different spline types, both interpolation and approximation, were investigated and splines more suitable for stem form representation than natural cubic spline are proposed. Their abilities to model the stem curve using different numbers of input points were compared using data of 85 carefully measured Norway spruce (Picea abies [L.] Karst.) stems. When modeling the whole stem profile all interpolation curves with second degree continuity suffer from oscillations. Approximation splines give satisfactory overall estimations, but they overestimate the lower stem and overestimate the upper stem. The best results were obtained with interpolation curves with first degree continuity. Stem curves were best described by the Catmull-Rom spline. Previously
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
GK - Forestry
OECD FORD branch
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Project
<a href="/en/project/QI102A079" target="_blank" >QI102A079: Research on biomass of broadleaved species</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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