Harmonization of Piece-by-Piece Measurement Methods of Roundwood Approved by Latvian Standard LVS 82:2003 “ Apaļo kokmateriālu uzmērīšana ”
DOI:
https://doi.org/10.17770/etr2013vol1.818Keywords:
roundwood, piece-by-piece measurement method, volumeAbstract
This paper analyses the volume differences of mixed pine and spruce roundwood loads and logs (roundwood assortiments) devided in to sample clusters according to the species, diameter, lenght and stem/log surface shape, stem zones and measured by the methods approved by standard LV 82:2003 „Apaļo kokmateriālu uzmērīšana”. The volumes of roundwood loads/logs determined by these methods were compared with the most precisious determination of the volume by Measuring Diameter in Short Intervals and the Top and Butt Diameter Measurement method. The volume of mixed pine and spruce round timber load determined by Measuring Diameter in Short Intervals using harvester measurement system is 2.44% higher than the volume determined by manual comparative the Top and Butt Diameter Measurement method. The volume deviation is in the range of accepted 3% measuring accuracy. The volumes of roundwood assortiments from neiloid zone of spruce stems determined according to the Mid Diameter Measurement method are 3.96% lower than the volumes determined by careful manual the Top and Butt Diameter Measurement method. The volume deviation surpass the acceptable measuring 3% accuracy. The volumes of roundwood assortiments from paraboloid zone of spruce and pine stems determined according to the Mid Diameter Measurement method are lower than the volumes determined by the Top and Butt Diameter Measurement method. The deviation is in the range of acceptable 3% measuring accuracy. This paper gives recommendations for adjusting the application area of different measurement methods for achieving the volume deviation in the range of accepted measuring accuracy.Downloads
References
Apaļo kokmateriālu uzmērīšana. LVS 82:2003.
Alberta Land& Forest Service. (2002) Alberta Scaling Manual. Alberta Land&Forest Service.Edmonton, Alberta. [Online]. Available: http://www.srd.gov.ab.ca/forests/ pdf/Introduction.pdf.[Accesed: Sept.10, 2012].
Conversion Factors (Raw Material/PRODUCT) for Forest Products, (UNECE/FAO,1987) [Online]. Available: http://timber.unece.org/fileadmin/DAM/publications/ECE_TIM_ 55.pdf.[Accesed: August 14, 2012].
Černy, M.; Parez, J. (1995) Tables and rational functions for calculation of log volume under bark. Praha
European Forest Sector Outlook Study 1960-2000-2020: Main Report (UNECE/FAO, 2005) [Online ]. Available: http://www. unece.org/timber/efsos/data/conversion-factors.pdf.[Accesed: December 17, 2012].
Finland Ministry of Agriculture and Forestry.(1997) Roundwood Volume Measurement Standards [Reg 918/66/97]. [Online]. Available: http://www.finlex.fi/data/normit/12590- 02074fil.pdf.[Accesed: October 16, 2012].
Hauffe, P.; Muller, L.G..Rundholzvermessung in Europa vereinheitlichen. Holz-zentralblatt 77, pp. 948
Janak, K (2005) Differences in volume of round Timber caused by different determination methods Drvna industrija 56 (4) pp.165-170.
Janak,K. (2007) Differences in roundwood measurements using electrinic 2D and 3D systems and Standard manual methodDrvna industrija Vol 58 (3) pp.127-133.
Mantau, Udo.(2008) Presentation given at the 2008 UNECE/FAO Workshop om National Wood Energy resources Balances. [Online]. Available: http://www. unece.org/Timber/ workshops/2008/wood-balance/presentations/01_Mantau.pdf [Accesed: Sept.12, 2012].
Northwest Log RULES Advisory Group. (2003). Official Log Scaling and Grading Rules. Northwest Log Advisory Group. Eugene, Oregon. [Online] Available: http://www.nwlrag.com/official_Rules_Revised.pdf.[Accesed: October 24, 2012].
Official Rules of the Log Scaling and Granding Bureaus(2011) Northwest Log Rules Eastside and Westside Log Scaling Handbook.
Patterson, D.W., Wiant, H.V. Jr. and Wood, G.B. Errors in estimating the volume of butt logs. For. Prod.J. 43(3); 1-4
Patterson, D.W., Wiant, H.V. Jr. and Wood, G.B. Comparison of the centroid method and taper systems for estimating tree volume, Hthn J. Appl. For. 10 (1): 8-9
Patterson, D.W., Wiant, H.V. Jr. and Wood, G.B. Log volume estimations: The centroid method and standard formulas. J.For.91: 39-41.
Round and sawn timber- Method of measurement of dimensionsEN 1309-2. Part2: Round timber- Requirements for measurement and volume calculation rules. (2006) Brussels
Sauter,U.,Staudenmaier,J.&Verhoff,S.(2010)Mehr Transparenz im Rundholzgeschalft Holz-Zentralblatt N.50,17. pp. 1269-1271.
Tabulky objemu kulatiny podle stredove tloušt’ky. ČSN 480007
The Swedish Timber Measurement Council.(1999) Regulations for Measuring of Roundwood (Circular VMR 1-99). Sweden.
Wiant,H.V., Wood, G.B. and Forslund, R.R. Comparison of centroid and paracone estimates of tree volume. Can.J.For. Res.21: pp.714-717
Wood,G.B. and Wiant, H.V. (1995) Modern methods of estimating tree and log volume, Proc.IUFRO Conference, Morgantown, West Virginia. West Virginia University Publication Services. p.168.
