indispensables.
Aerial photographs
are
divided
into
three
categories:
vertical, oblique, and panoramic.
(1) A vertical aerial photograph (Figure 1-1) is taken with the camera
axis perpendicular to the earth's surface. It is the most difficult to use
for the novice photo reader, because people are not used to viewing objects
from directly overhead.
However, the trained IA can achieve the best
results from vertical photography through the use of stereovision (Figure
1-2). In the stereogram (Figure 1-7) the average photo reader might locate
the cargo truck at Annotation 'a' but without stereovision, few will find
the camouflaged equipment at 'b' or the generator at 'c' and the trailer
with an unidentified shed or tank at 'd".
Figure 1-1.
Vertical Photo.
IT 0649
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