TM 5-6675-323-14
g. Compute elevation. When numerical value and sign of differential parallax
h a v e been determined, height above or below datum may be computed:
H
h=
Where:
h = D i f f e r e n c e in elevation between datum plane and point in
feet.
H = Absolute altitude in feet.
=
Differential parallax in millimeters (to nearest 0.01 mm).
b = Distance between principal points of photographs in milli-
meters.
h . C o m p u t e r e l a t i v e e l e v a t i o n . S m a l l changes in elevation from one point to
another point may be computed using the following formula:
10-11
