Canadian Forest Service Publications

Mesure de la hauteur des arbres avec la perche Sokkisha : test de précision. 1995. Zarnovican, R.; De Grâce, J. The Forestry Chronicle 71 : 616-620.

Year: 1995

Issued by: Laurentian Forestry Centre

Catalog ID: 16695

Language: French

Availability: PDF (request by e-mail)

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Abstract

The accuracy of measuring tree height using a Sokkisha pole compared with that obtained using a tape measure was tested. This test was conducted in young thinned balsam fir stands in the Upper North Shore region of the province of Quebec. The results show a slightly negative bias, -0.06 m or -1.03%, significantly different from zero at the 95% probability level. A study of the precision shows that the mean quadratic error does not exceed ±0.11 m or ±1.77%. Using the prediction interval, we can be 95% confident that in a single future measurement, the error will be arround ±0.21 m or ±3.49%. According to tolerance interval, we can be 95% confident taht at least 95% of the population of errors produced by using the pole will fall between ±0.23 m or ±3.9%.