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Photogrammetric Technician

Real-Life Activities

Real-Life Math -- Solution

You are shown a map with 2 street intersections. The distance between them on the map is 2 inches. The actual distance on the ground is 2,000 feet.

2 inches = 2,000 feet, therefore
1 inch = 1,000 feet

The scale is 1:1,000.

The flight height (the height the plane was flying when the photograph was taken) is 3,000 feet. The focal length of the camera is 6 inches.

3,000 feet = 6 inches
3,000 / 6 = 500
500 feet = 1 inch

The scale is 1:500.

"Photogrammetry is all about the transformation of measured coordinates on a photograph to ground coordinates. Whatever you are mapping, those measurements need to be manipulated and adjusted. The entire field of geomatics is mathematical," says Ken Sherman, a geomatics instructor.


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