| http://dbpedia.org/ontology/abstract
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In forestry, quadratic mean diameter or QM … In forestry, quadratic mean diameter or QMD is a measure of central tendency which is considered more appropriate than arithmetic mean for characterizing the group of trees which have been measured. For n trees, QMD is calculated using the quadratic mean formula: where is the diameter at breast height of the ith tree. Compared to the arithmetic mean, QMD assigns greater weight to larger trees – QMD is always greater than or equal to arithmetic mean for a given set of trees. QMD can be used in timber cruises to estimate the standing volume of timber in a forest, because it has the practical advantage of being directly related to basal area, which in turn is directly related to volume.QMD can also be calculated as: where BA is stand basal area, n is the number of trees, and k is a constant based on measurement units - for BA in ft2 and DBH in inches, k=0.005454; for BA in m2 and DBH in cm, k=0.00007854. for BA in m2 and DBH in cm, k=0.00007854.
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28287810
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1511
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1110229465
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http://dbpedia.org/resource/Quadratic_mean +
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, http://dbpedia.org/resource/Basal_area +
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, http://dbpedia.org/resource/Diameter_at_breast_height +
, http://dbpedia.org/resource/Arithmetic_mean +
, http://dbpedia.org/resource/Timber_cruise +
, http://dbpedia.org/resource/Forestry +
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http://dbpedia.org/resource/Category:Forest_modelling +
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http://en.wikipedia.org/wiki/Quadratic_mean_diameter?oldid=1110229465&ns=0 +
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| rdfs:comment |
In forestry, quadratic mean diameter or QM … In forestry, quadratic mean diameter or QMD is a measure of central tendency which is considered more appropriate than arithmetic mean for characterizing the group of trees which have been measured. For n trees, QMD is calculated using the quadratic mean formula: where BA is stand basal area, n is the number of trees, and k is a constant based on measurement units - for BA in ft2 and DBH in inches, k=0.005454; for BA in m2 and DBH in cm, k=0.00007854. for BA in m2 and DBH in cm, k=0.00007854.
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| rdfs:label |
Quadratic mean diameter
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