TM 5-6675-322-14
GLOSSARY
ABBREVIATION/TERM
Absolute Altitude . . . . . . . . . . .
Collimating Marks . . . . . . . . . . .
Differential
Parallax
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Diopter. . . . . . . . . . . . . . . .
Fiducial Mark . . . . . . . . . . . . .
Hectare. . . . . . . . . . . . . . . .
Interpupillary
Distance
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P r i n c i p a l P o i n t o f P h o t o g r a p h . . . . .
Stereo-Pair
Photograph
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Stereoscopic . . . . . . . . . . . . .
DEFINITION
A l t i t u d e o f a i r c r a f t a b o v e s u r f a c e o f e a r t h.
Marks on edge of photograph to indicate
optical center of photograph.
Small linear displacement between same photo-
graphic images on different photographs
r e s u l t i n g f r o m
h e i g h t o f s u r f a c e.
Measurement of lens power and refraction.
Marks on edges of aerial photographs used
to determine center of photograph.
A metric measure of surface, equal to
10,000 square meters (100 ares, or 2.471
a c r e s ).
Distance between center of observer’s eyes.
Center of photographic image.
Photographs taken of same object or area
f r o m d i f f e r e n t p o s i t i o n s.
An apparent three-dimensional image obtained
when viewing stereo-pair photographs.
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