Another factor of a more abstract nature is your own personal experience. You
know what a school looks like because you are familiar with its structure,
features, and surroundings. The same applies to the recognition of churches,
parking lots, and industrial buildings. The soldiers who have been in combat
areas can readily recognize defensive works such as trenches, bunkers, and
machine-gun positions because of their makeup, concentration, and tactical
layout on the ground. This knowledge aids you materially in developing the skill
necessary to recognize and identify familiar objects on aerial photography.
PART B: USING A MILITARY INSTALLATION KEY
Military installations are items of military significance some of which could be confused
with civilian activities. The following steps and key should assist you in your identification
of military installations.
Step 1: Determine whether the image is natural or manmade (Figure 1-6).
Figure 1-6. Image - Natural or Manmade.
a. Natural objects, such as trees, rocks, and shrubs, tend to have an irregular
b. Manmade objects, such as buildings, vehicles, fences, and bridges, tend to have
even lines, distinctive shapes, and standard tones.
2. Step 2: Determine whether the image is a military or civilian installation, or a
combination thereof (Figure 1-7).
Figure 1-7. Civilian, Military, or Both.