Advanced Photography Course

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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DOFMaster for Windows On-line Depth of Field Calculator DOFMaster for Mobile Devices On-line Depth of Field Table Hyperfocal Distance Chart Articles FAQ Recommended Books Support Contact Links Home As an Amazon Associate I earn from qualifying purchases.	contents <- previous page next page -> 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 contents Advanced Photography Course <- previous page next page ->	As an Amazon Associate I earn from qualifying purchases.
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