TM 5-6675-323-14
(3) Make elevation reading (paragraph 10-6.2 e). Micrometer reads 3.98 mm.
(4) Subtract readings. Difference is 0.60 mm. Reading is increased so sign
is + (plus).
(5) Measure distance (principle point separation). Distance is 76.2 mm.
(6) Height of aircraft was 5000 ft above sea level.
H = 5000 ft
= +0.60 mm
b = 76.2 mm
H
h
=
--
3000
5000 X 0.60
=--=
39
ft
h=
76.80
7 6 . 2 + 0.60
Example (2):
Using same photographs, determine height of
building.
M a k e datum reading at base of building. Reading is 4.28
1.
mm.
Make elevation reading at top of building. Reading is
2.
4.58 mm.
10-13
