(map; aerial; ground) (2-6)
FRAME 2-7.
Under ideal conditions, all three methods are employed, supplementing each other, and rounding out the
available information.
The three methods of engineer reconnaissance, __________________________, _______________________,
and _______________________, ___________________________ each other in obtaining information about an
area.
(up-date; current; comprehensive) (2-30)
FRAME 2-31.
Aerial photography has certain disadvantages which make it impractical to rely on photos alone for an area
study. Although the camera picks up everything within its range, critical detail can be obscured by clouds, dense
foliage, heavy snow, or deep shadows. Bad weather can ground aircraft, making it sometimes impossible to obtain
new photos when they are most needed.
Conditions can cause critical detail to be ________________________________ on aerial photos, or aircraft to
be _________________________.
2-15
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