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dc.contributor.authorBrewer, Julia
dc.contributor.authorTalbot, Bruce
dc.contributor.authorBelbo, Helmer
dc.contributor.authorAckerman, Pierre
dc.contributor.authorAckerman, Simon
dc.date.accessioned2018-09-10T12:31:14Z
dc.date.available2018-09-10T12:31:14Z
dc.date.created2018-04-17T09:35:38Z
dc.date.issued2018-04-13
dc.identifier.citationAnnals of Forest Research. 2018, .nb_NO
dc.identifier.issn1844-8135
dc.identifier.urihttp://hdl.handle.net/11250/2561789
dc.description.abstractProductivity of a mechanized P. patula cut-to-length harvesting operation was estimated and modelled using two methods of data collection: manual time study and follow-up study using StanForD stem files. The objective of the study was to compare the productivity models derived using these two methods to test for equivalence. Manual time studies were completed on four different machines and their operators. Two Ponsse Bear harvesters fitted with H8 heads, and two Ponsse Beaver harvesters, fitted with H6 heads, were included. All machines were equipped with Ponsse Opti2 information system. All four operators had approximately 1 year of experience working with their respective machines. The four machines worked in separate four-tree-wide harvesting corridors, and they each harvested 200 trees. Individual tree diameter at breast height (DBH), and height measurements were made manually. Subsequently, data on the trees in each study were extracted from the StanForD stem reports from each of the harvesters. Cycle times in the stem reports were determined based on the difference between consecutive harvest timestamps. The two methods were compared in terms of their abilities to estimate equivalent measures for tree DBH, volume, and productivity. In all four cases, significant differences were found between the DBH and volume measures derived using the two methods. Subsequently, the volume measures from the manual methods were used as the basis for productivity calculations. Results of the productivity comparisons found no significant differences between the models developed from the two methods. These results suggest that equivalent productivity models can be developed in terms of time using either method, however volume discrepancies indicate a need to reconcile bark and volume functions with the high variability experienced in the country.nb_NO
dc.language.isoengnb_NO
dc.titleA comparison of two methods of data collection for modelling productivity of harvesters: manual time study and follow-up study using on-board-computer stem recordsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.rights.holderAll the papers published in Annals of Forest Research are available under an open access policy (Gratis Gold Open Access Licence), which guaranty the free (of taxes) and unlimited access, for anyone, to entire content of the all published articles. The users are free to "read, copy, distribute, print, search or refers to the full text of these articles", as long they mention the source. Also, "users can use, reuse and build upon the material published in the journal but only for non-commercial purposes". The other materials (texts, images, graphical elements presented on the Website) are protected by copyrightnb_NO
dc.source.pagenumber109-124nb_NO
dc.source.journalAnnals of Forest Researchnb_NO
dc.identifier.doi10.15287/afr.2018.962
dc.identifier.cristin1579698
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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