Surveying; Leveling
Surveying; Leveling
(OP)
I would like to ask a few question for levelling. Is it even possible to measure the height different at the same location? For example, I want to measure the height of a tree at the bottom and at the top of the tree using levelling. Is this possible? If so how would one do it. (Automatic levelling)
Thanks
Thanks





RE: Surveying; Leveling
A fundamental purpose of surveying is to be able to create a 3D coordinate system. If you wanted to measure the height of a tree then you'd probably be better off using a theodolite to measure the angle from the bottom to the top. You'd need to measure the distance between the theodolite and tree too (correcting for any change in level of the ground).
An undergraduate-level textbook on surveying will definitely contain the procedure (it's all just trigonometry!).
RE: Surveying; Leveling
RE: Surveying; Leveling
Just to reiterate: I recommended using a theodolite.
RE: Surveying; Leveling
The two shadow lengths should be measured within minutes of each other to increase accuracy
Then cross multiply
RE: Surveying; Leveling
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Surveying; Leveling
RE: Surveying; Leveling
drop a plum bob down, hold the top at the top of the tree and make sure it hangs vertically without hitting the trunk
use the level to sight to the plum bob
measure the length of the string
add in the height of the plum bob from the ground
from that you can establish the elevation at both the ground and the top of the tree
with a tall enough "rod" you could do it without a plum bob
or use a theodolite
RE: Surveying; Leveling
I am not affiliated with Forestry Suppliers and will receive no benefit from this referral....I just get their catalogs and I have purchased a few items from them!