The area covered by an aerial photograph (air photo) depends on the scale of the imagery. Most air photos were taken on 9 x 9 inch film. The chart below reflects coverage for a variety of photographic scales.
|Scale||1 inch = feet||1 side (miles)||Area (square miles)|
Note: The photo scale is determined by dividing the flying height by the camera focal length.
Example: If the flying height is 20,000 feet and the camera focal length is 6 inches, then:
20,000 feet ÷ 0.5 feet = 40,000 scale or 1:40,000