The accuracy and reliability of timber measurement and log volume determination by harvesters

The aim of the submitted monograph was to develop and verify a methodology according to which it would be possible to identify objectively factors on which the accuracy and reliability of data out ...

The aim of the submitted monograph was to develop and verify a methodology according to which it would be possible to identify objectively factors on which the accuracy and reliability of data outputs on timber dimensions and volume provided by harvester measuring systems depend. In the first phase, purely theoretical data were gathered about timber measurement and volume determination with the emphasis on harvester measuring systems and electronic systems for receiving inspection in sawmills. The harvester measuring systems were then analysed for the basic principles of gauging, calibration and adjustment including basic measuring algorithms. In the second phase, the measuring harvester system was tested on John Deere harvester simulator. The third phase included field measurements. Three sample trees of Norway spruce were chosen and felled by a harvester. Then, the produced logs were measured by using other four methods of meas urement, manual measurement, measurement by 3D scanner, image analysis and measurements in the sawmill.