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Camera Matching:
The location of the camera must be recorded, either by marking an
aerial photo or site plan, or recording the GPS coordinates.
Videoscapes uses a camera mounted GPS device which appends the
picture file written by the camera, providing latitude, longitude,
and elevation.
The orientation of the camera must also be recorded. Under no
circumstances should the horizon be anything other than level (green
line). This can be confirmed by using a bubble level mounted
on the tripod or the camera. The compass bearing, that is, the
direction in which the camera is "looking" can be recorded with a
digital compass. This is typically expressed as degrees of a
circle, with 0° being North, 90° being East, 180° South,
and 270° being West. Be sure to specify magnetic or true
North.
Camera tilt is expressed as degrees, with 0° being perfectly
horizontal, -90° is looking straight up at the sky, and 90°
would be looking straight down. If the location of the
camera is higher or lower than the project, it may have to be tilted
to frame the picture properly. This can be read off of a
tripod mounted protractor.
The lens focal length must also be recorded. This is the
subject of the next page.
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