TM 5-6675-322-14
Example:
Area is 7 hectares; area is between 4 and 8 hectares. Use 3.8 points per
hectare.
3.8X 7 = 26.6
26.6 sampling points required. Scale 2 used; multiply by 0.6 .
0.6 X 26.6 = 15.96
Use next higher number: 16.
(h) Average readings at each of 16 points to determine basal area per
h e c t a r e f o r e n t i r e a r e a .
(2) Measurement of tree diameter.
First determine distance from tree:
NOTE
Tree diameters may be measured from distances of 15, 20, 25 or 30 meters.
( a ) A s t a f f o r s t i c k 2 m ( 7 8 . 7 i n . ) i s p l a c e d v e r t i c a l l y a g a i n s t
t h e t r e e .
(b) Aim instrument at middle of staff and push release button to
f r e e s c a l e.
Release button when scale is stabilized.
(c) Turn instrument 90° to the left, and move toward or away from
s t a f f u n t i l b o t t o m o f s t a f f i s a l i n e d w i t h b o t t o m o f s c a l e 2 a n d t o p o f s t a ff
reaches 15, 20, or 30 m line.
Operator’s distance from the tree is then 15, 20, 25
or 30 m.
9-50
