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Analysis of the volume differences between measuring of standing timber auctions and primary records of harvesters
Sedmíková, Monika ; Natov, Pavel (advisor) ; Dvořák, Jiří (referee)
The aim of this thesis is to compare the volume output from electronic auctions and present auctions of standing volume, awarded by the state enterprise Lesy České republiky (LČR) with individual volumes obtained (by volume) of electronic measurement of properly calibrated harvester on a production site, "P ˝ (stump).
Data were obtained from the company 1. Lesní realitní s. r. o. which is involved in electronic and present auctions offered by LČR. It was compared 47 auctions, which the company won during the four years (2012 - 2015). Of the 47 auctions were 40 auctions electronic and 7 auctions present. Data about standing volume were taken from input sheets of these auctions. Subsequently were taken data from printed output of a optimising and control software (Motomit IT) of harvester type Logset H8. The control measurement was made before logging in each stand and after that, eventually, the calibration was also made. Results showed that the volumes offered in the auctions are bigger than the volumes determined by harvester. The total volume of timber determined through auctions was 21 385,54 m3, but the total volume of timber identified by harvester was 20 298,16 m3. The difference between these values was 1087, 39 m3. They were also determined differences between the volume of timber measured by harvester and measured by LČR after categorization auctions according to the volume of wood. It was found that in the category of 0 - 300 m3 differences were 3,41 %, in the category of 300 - 600 m3 differences were 4, 38 % and in the last category 600 - 1100 m3 was a difference of 8, 32 %. Statistical evaluation, however, showed that the differences between the categories are not significant. Further differences were determined by tree species. The greatest differences were in pine 8,70 %, then larch 6,70 % and the minimum differences exhibited spruce 4,51 %.
The results can be applied as a basis for companies engaged in buying tim-ber in auctions. Determined differences, buyers can take into account when making bids. These bids are reflected in the total gains or losses.
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