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首页> 外文期刊>Journal of Arboriculture >Comparing formula methods of tree appraisal.
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Comparing formula methods of tree appraisal.

机译：比较树木评估的公式方法。

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Values produced by formula methods of tree appraisal used in five different countries were compared ((CTLA) -- USA, Standard Tree Evaluation Method (STEM) -- New Zealand, Helliwell -- Great Britain, Norma Granada -- Spain, and Burnley -- Australia).Nine individuals appraised the same six trees (Quercus palustris, Ulmus americana, Tilia spp., Gymnocladus dioica, Fagus sylvatica and Fraxinus excelsior) using all five methods. The CTLA and Helliwell methods consistently produced the lowest values, and the Norma Granada method values were most often the highest. There was a strong relationship between variation among appraisers and the mathematical operations used in calculating the formula values. The Helliwell method, which multiplies all of the rated factors together, consistently produced the highest variation among appraisers. STEM, which adds all the factors together, consistently produced the lowest variation among appraisers. Minimizing the number of multiplication operations used in the formulae is an effective way of reducing appraiser variation, but in doing so, the influence of individual factors may be diminished too much.
机译：比较了在五个不同国家/地区使用的树木评估公式方法所产生的价值（（CTLA）-美国，标准树木评估方法（STEM）-新西兰，Helliwell-英国，Norma Granada-西班牙和Burnley- -澳大利亚）。九个人使用所有五种方法对相同的六棵树进行了评估（栎木，美洲榆树，pp树属，裸子草、,木和优良白蜡树）。 CTLA和Helliwell方法始终产生最低值，而Norma Granada方法值通常最高。评估者之间的差异与用于计算公式值的数学运算之间存在很强的关系。将所有额定因子相乘的Helliwell方法始终在评估师中产生最大的差异。将所有因素加在一起的STEM始终在评估人员中产生最低的变化。最小化公式中使用的乘法运算的数量是减少评估者差异的有效方法，但这样做可能会大大降低各个因素的影响。

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