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External baseline method developed by Robert T. Leverett [34] [35] [36] is based upon the idea that there will be difference in the angle to the top of an object if it is viewed from two different distances along a common baseline. The height of the tree above a level baseline can be determined by measuring the angle to the top of the tree from ...
When taking forest inventory the following are important things to measure and note: species, diameter at breast height (DBH), height, site quality, age, and defects. From the data collected one can calculate the number of trees per acre, the basal area, the volume of trees in an area, and the value of the timber. Inventories can be done for ...
Tree height is the vertical distance between the base of the tree and the highest sprig at the top of the tree. The base of the tree is measured for both height and girth as being the elevation at which the pith of the tree intersects the ground surface beneath, or "where the acorn sprouted."
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. [citation needed] Some trees have branches at or lower than a height of 4.5 feet (1.37 m).
Borderline trees occur only when the distance from the sampling point to the center of the tree is equal to the DBH times plot radius factor (PRF). The PRF is determined based on the type of prism or angle gauge being used. Basal Area Factor (BAF) 5, 10, and 20 angle gauges result in PRFs of 3.89, 2.75, and 1.94 (feet inch −1) respectively.
When used in forestry, the tree caliper tool measures the DBH or "diameter at breast height" of a tree that is growing in a landscape of any kind. The measurement is generally made at 4.5' or 1.4m above the soil. Caliper measurements on nursery stock trees describe the size of the plant material being sold.
Girard form class is a form quotient calculated as the ratio of diameter inside bark at the top of the first 16 foot log to the diameter outside bark at breast height ().Its purpose is to estimate board-foot volume of whole trees from measurement of DBH, estimation of the number of logs, and estimation of the taper of the first log, based on the general relationships identified between the ...
[53] [54] Breast height is defined differently in different situations, with most forestry measurements taking girth at 1.3 m above ground, [54] while those who measure ornamental trees usually measure at 1.5 m above ground; [53] in most cases this makes little difference to the measured girth.