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Forward Overlap
Number of Exposures

Photography (Advanced) - Advanced manual for photography and other graphic techniques
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Figure  417.—Forward  overlap. Figure 4-18.—Effect on scale when photographing over rough terrain. missed.   Since   only   the   central   portion   of   each photograph is used in a mosaic map, each successive strip  must  overlap  the  preceding  strip.  This  overlapping of strips is called SIDE LAP. Side lap for mosaic maps is usually 40 percent (fig. 4-19). Since each flight strip is overlapped 40 percent, only 60 percent of sideways usable area remains on each   negative.   To   find   the   amount   of   usable ground-gained  sideways,  multiply  the  ground  coverage by 0.60. For example, when the ground coverage is 9,000 feet, the usable ground-gained sideways (GGS) is 5,400 feet (9,000 0.60 = 5,400). The shorter dimension of the negative is always used for the GGF. This is to limit the number of flight lines to as few as possible. This helps to eliminate the Figure  419.—Side  lap. 4-21







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