FORESTRY
GENERAL FORESTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When using the “percent” scale on an Abney level, what distance should you be from a tree?
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100 feet
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66 feet
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1 chain
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10 paces
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Explanation:
Detailed explanation-1: -Many clinometers and Abney levels have a percent-grade scale that gives 100 times the tangent of the angle. This scale gives the tree height in feet directly when measured at a distance of 100 feet (30 m) from the tree. The same process is used to measure the height of the base of the tree above or below eye level.
Detailed explanation-2: -Slope is determined by the height of the hand level divided by the distance to the point multiplied by 100. Using me as an example: If the distance to the point I sighted is 50 feet, the slope percent would be 5.5 ÷ 50 x 100 = percent slope, or 0.11 x 100 = 11 percent slope.
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