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The thickness of the crown and the average crown spread will be measured and the general crown shape of the tree will be determined by visual comparison with a chart. The crown shape will be used to derive a crown form (CF) value for different tree shapes and will be the third parameter of the crown volume calculation formula.
Crown spread is a measure of the footprint or plan area of the crown of the tree expressed as a diameter. [2] The most basic crown spread measurement is the average length of two lines across the crown area. The first measurement is made along the longest axis of the crown from one edge to the opposite edge.
The girth measurement should then be taken at the narrowest point below the odd growth and the height of the girth measurement noted. In some cases a girth taken just above the odd growth will be more representative of the actual girth of the tree. In these cases the measurement should be taken there and the height above the base of the tree noted.
For example, the Middleton Live Oak (Quercus virginiana), height 67.4 feet, dbh 10.44 feet, crown spread 118 feet) was found to have a trunk volume of 970 ft 3 (24.5 m 3) and a branch volume of 3,850 ft 3 (109 m 3) [15] The branch volume was almost 4x that of the trunk.
No direct measurement to the tree's trunk or top is taken in the parallax Method. Three verticals method (formerly the triangle method) is a modification of the simpler parallax method. [39] It is possible to measure the height of a tree indirectly without taking any horizontal sweep angles, which can be difficult to obtain accurately in the field.
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Stocking is a quantitative measure of the area occupied by trees, usually measured in terms of well-spaced trees or basal area per hectare, relative to an optimum or desired level of density. [1] It is also used as a measure of the growth potential of a site that may be affected by vegetation in the area along with other nearby trees.
By that time, the champion tree had attained a trunk circumference of 10 ft 8 in (3.25 m), a height of 129 ft (39 m) and a crown spread of 70 feet. [8] The American Forests formula for assigning point scores to nominated trees is trunk circumference (in inches) + height (in feet) + 1 ⁄ 4 average crown spread (in feet), resulted in an overall ...