Nikon D200 Manuel d'utilisation - Page 11

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Nikon D200 Manuel d'utilisation
2.1 Identify Customer Requirements
The flight crew needs the following information to assure successful acquisition of the
aerial photographs required by the customer:
Type of mission. The major types are:
 Spot Photography
 Route Photography
 Photographic Mapping
Location
 Target location(s) for spot photography
o Specific type of pattern to be flown at target
 Beginning and end of a route (highway, shoreline, river)
o Percent of successive photo overlap
 Corner point coordinates defining area for photographic mapping
o Amounts of successive photo overlap and parallel photo overlap
Ground level coverage of each photograph (how many feet wide and how many feet deep)
Camera pointing angle (how many degrees down from the horizontal)
Resolution at ground level at the center of the photograph
2.2 Translate customer requirements into specific photographic shooting parameters to
include:
 Altitude above ground (AGL)
 Aircraft speed
 Pattern at target
 Camera pointing angle
 Lens focal length
 Time between photographs (required for route photography and photographic mapping)
Altitude above ground level (AGL)
1200 feet AGL is an ideal altitude for aerial photography; the closer to the ground, the
less build-up of haze and thus a clearer photograph. Higher altitudes allow for more
ground coverage per picture but at lower ground resolution.
Aircraft Speed
At 90 Knots, the aircraft moves 150 feet per second. This is a good speed for aerial
photography.
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2.0 Pre-Mission Planning