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Used to measure diameter at breast height
(DBH) of a tree
taken 1.37m (4.5 ft) up from the ground, approximately breast height for most people.
Process of measuring tree diameter is as follows:
1. locate height of tree 1.4m off the ground.
2. use hook at end of diameter tape to grasp into bark of tree.
3. walking around the tree, measure tree diameter, ensuring to keep the tape straight all the way around the tree.
4. record the measurement to the nearest millimetre.
Tree calipers can also be used for quick and accurate measurements of tree diameters.
1. hold calipers at DBH and ensure both sides of caliper are tight against the stem.
2. record the reading.
3. In some cases 2 measurements may be recorded and an average taken as not all trees grow in a perfect circle, many trees produce reaction wood resulting in oblong shapes.
Look into the lens while looking
at the tree
You should see several number scales
"-" numbers on this side of zero
"0" indicates you are looking directly straight in front of you
"+" numbers on this side of zero
horizontal crosshair
Math formula to find tree height:
a-b=tree height in metres.
Example:
We want to know the height of this
beautiful Dawn-Redwood
Suunto, locate the horizontal cross hair line.
top reading is + 18
remember to project your sight
through the canopy to the highest
point (if necessary)
remember: if standing on level ground a bottom reading of "0"would read approximately at eye level up on the tree
Calculations:
formula: a-b= tree ht.
18-(-1.5)
=18+1.5
=19.5
Therefore the height of the tree
is 19.5 metres.
bottom reading is -1.5
reading at the base of the tree, where
the trunk meets the ground.
using 1:20 scale.
(we have measured 20m on
the ground from the base of the tree
to take the reading).
2 sided: Back side is standard metric tape (decimetres).
Front side appears as imperial tape (inches) but it is not! It has done the math by measuring circumference and converting to a diameter measurement
A standard tape measure would be measuring circumference, however we want to know DIAMETER
Therefore Circumference/3.14 (Pi) has already been done to save us a step.
www.georgiacountry.com