High tree is one dimension that is used in the measurement timber. Tree height is defined as the distance or length of the shortest line between a point on the tree by its projection on a flat surface (more details can be seen in Figure 24).
Figure 24. Tree height
From the picture, it is instructive:
1) The total height is the shortest distance from point to point treetop projection on a flat plane.
2) High-tree bole (Tbc) is the shortest distance from point to point bole projection on a flat plane.
Things to remember!
The term applies only tree height for trees that are still standing, while for tree felling of trees used long term. Furthermore, the question may arise in your mind is how to measure the height of a tree? To answer these questions, let you see the following description!
The formula is based on the angle-degree
The formula is based on a formula high goniometry ie tangent formula. Height measurement is illustrated in the form of an isosceles triangle with a corner in the second leg of 45o. Keidentikkan associated with range-degree angle (φ = δ) against the angle-percent (φ = δ), so that the amount of 45 o identified with 100% (Figure 25).
Figure 25. isosceles triangle
Furthermore, the formula developed by considering the position / position of the eyes when aiming tree or trees opposite position when shot. There are three positions on the eye when shooting a tree, namely:
1) The position of the eye located between the base and the top rod (rod tip / canopy, bole or certain high) and shoot direction parallel to the flat / flat crosshairs direction (Figure 26).
Figure 26. The basic formula of high based on the position (1)
From the images could be obtained high trees formula, namely:
T = (t1 + t2)
T = (Sn x tangent α) + (Sn x tangent β)
T = Sn x (tangent to tangent α + β)
Information :
T = total tree height (m)
t1 = BC tree height (m)
t2 = AB tree height (m)
Sn = distance between the viewfinder flat with trees (m)
α = angle formed when shooting treetops (m)
β = angle formed when aiming the base of the tree (m)
2) The position of the eyes is still located between the base and the top of the stem, but the direction is not parallel to the plane shutter panel / viewfinder upward direction (Figure 27).
Figure 27. The basic formula of high based on the position (2)
From the images could be obtained high trees formula, namely:
T = (t1 + t2)
T = (Sn x tangent α) + (Sn x tangent β)
T = Sn x (tangent to tangent α + β)
Information :
T = total tree height (m)
t1 = BC tree height (m)
t2 = AB tree height (m)
Sn = distance between the viewfinder flat with trees (m)
α = angle formed when shooting treetops (m)
β = angle formed when aiming the base of the tree (m)
3) The position of the eyes is lower than the base of the stem / shoot upward direction (Figure 28).
Figure 28. The basic formula of high based on the position (3)
From the images could be obtained high trees formula, namely:
T = (t1 – t2)
T = (Sn x tangent α) – (Sn x tangent β)
T = Sn x (α tangent – tangent β)
Information :
T = total tree height (m)
t1 = BC tree height (m)
t2 = AB tree height (m)
Sn = distance between the viewfinder flat with trees (m)
α = angle formed when shooting treetops (m)
β = angle formed when aiming the base of the tree (m)