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Research article - Peer-reviewed, 2020

Modeling the productivity of mechanized CTL harvesting with statistical machine learning methods

Liski, Eero; Jounela, Pekka; Korpunen, Heikki; Sosa, Amanda; Lindroos, Ola; Jylha, Paula

Abstract

Modern forest harvesters automatically collect large amounts of standardized work-related data. Statistical machine learning methods enable detailed analyses of large databases from wood harvesting operations. In the present study, gradient boosted machine (GBM), support vector machine (SVM) and ordinary least square (OLS) regression were implemented and compared in predicting the productivity of cut-to-length (CTL) harvesting based on operational monitoring files generated by the harvesters' onboard computers. The data consisted of 1,381 observations from 27 operators and 19 single-grip harvesters. Each tested method detected the mean stem volume as the most significant factor affecting productivity. Depending on the modeling approach, 33-59% of variation was due to the operators. The best GBM model was able to predict the productivity with 90.2% R-2, whereas OLS and the SVM machine reached R-2-values of 89.3% and 87% R-2, respectively. OLS regression still proved to be an effective method for predicting productivity of CTL harvesting with a limited number of observations and variables, but more powerful GBM and SVM show great potential as the amount of data increases along with the development of various big data applications.

Keywords

Productivity; cut-to-length; harvester; machine learning; gradient boosted machine; support vector machine; regression model

Published in

International Journal of Forest Engineering
2020, volume: 31, number: 3, pages: 253-262
Publisher: TAYLOR & FRANCIS INC

Authors' information

Liski, Eero
Natural Resources Institute Finland (Luke)
Jounela, Pekka
Natural Resources Institute Finland (Luke)
Korpunen, Heikki
Natural Resources Institute Finland (LUKE)
Sosa, Amanda
Waterford Institute of Technology
Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology
Jylhä, Paula
Natural Resources Institute Finland (LUKE)

UKÄ Subject classification

Forest Science

Publication Identifiers

DOI: https://doi.org/10.1080/14942119.2020.1820750

URI (permanent link to this page)

https://res.slu.se/id/publ/109526