they stopped measuring crown to rump in 2002.
they stopped measuring crown to rump in 2002.
when do they stop measuring crown to rump?
2002
Na
Na
the surveyor locates the point on the ground immediately below the branch tip on one end of the measurements and marks that position. he then moves to opposite side of the crown and locates the point under that branch tip. the spread along that line is the horizontal distance between those two positions. on steeply sloping ground (over 15 degrees) the taped distance between the two points can be corrected to a true horizontal by using basic trigonometry. horizontal distance = cos (inclination) × slope distance. the help of an assistant or the use of a laser rangefinder can greatly speed this process. when using a laser rangefinder, as in measuring tree height, several points on the far edge of the crown can be explored to find the furthest point. a laser rangefinder is also useful for measuring crown spread where one side of the crown is not easily accessible, such as a tree growing on a cliff side or other barrier. measurements using a laser rangefinder if made at a steep angle greater need to be corrected for true horizontal distance using the formula above.
tree crown measurement