Nikon D200 Manuale operativo - Pagina 15

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Determining Number of Photos

For spot photography, take multiple photos as appropriate. More are better than less!

For route photography and aerial mapping, one must determine the length of each leg.

Using a map, determine each leg length in statute miles. Multiply the leg length in statute

miles by 5280 feet per mile. Divide that number by the length of each photo less the

photo overlap (see "Selecting a Time Interval" above). The result is the number of photos

that need to be taken during the leg. Program the Multi Function Timer Remote Control

with the result. For example, for a leg length of 8 miles and a 25% overlap of photos with

each photo 800 feet wide, 5280x8=42,240. (100%-25%) x 800 feet = 600 feet.

42,240/600 = 70 photos.

2.3 Planning the Flight Path

A spot photography mission requires that the target-center be accurately located and that

the flight pattern to be flown around the target be defined. This will require accurate

determination of waypoints which are defined by their latitude and longitude. Those

numbers will be used by the flight crew to program the aircraft GPS accordingly.

An aircraft sectional map can be used to determine the numbers. All qualified flight crew

members know how to do so.

An alternative is to use a computer-based mapping program such as DeLorme Street

Atlas or Google Earth. DeLorme Street Atlas has the advantage that it is self contained on

the computer and does not require an Internet connection to work. Google Earth is a

better alternative where a Web connection is available. Both are on the FL051 ADIS

computers. When using either program, make sure the positional information is displayed

in degrees, minutes and fractional minutes (D M.M) and not degrees, minutes and

seconds. See the program help section for instructions on how to make the change if

required.

The following is a snapshot of a Street Atlas map: