OVERLAP

1. In photography, the amount by which one photograph includes the same area covered by another, customarily expressed as a percentage. The overlap between successive air photographs on a flight line is called “forward overlap.” The overlap between photographs in adjacent parallel flight lines is called “side overlap.” 2. In cartography, that portion of a map or chart that overlaps the area covered by another of the same series. 3. In naval mine warfare, the width of that part of the swept path of a ship or formation that is also swept by an adjacent sweeper or formation or is reswept on the next adjacent lap.