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GEOMATICS AREAS OF STUDY |
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PHOTOGRAMMETRY
is the science of obtaining reliable measurements from photographs (images)
in order to determine characteristics such as: size, shape, and position of
photographed objects. The objective of photogrammetry is to invert the
process of photography to reconstruct object space features such as
buildings, roads, and shore lines. The output of
photogrammetry is typically a map, drawing or a 3D model of some real-world
object or scene. Many of the maps we use today are created with
photogrammetry and photographs taken from aircraft. Photogrammetry can be
classified in a number of ways. One standard method is to divide
photogrammetry based on camera location during photography. On this basis we
have Aerial Photogrammetry, and Close-Range Photogrammetry. In Aerial
Photogrammetry the camera is mounted in an aircraft and is usually
pointed vertically towards the ground. Multiple overlapping photos of the
ground are taken as the aircraft flies along a flight path. These photos are
processed to generate several products such as topographic maps, contour
plans, and 3D surfaces In Close-range Photogrammetry
the camera is close to the object and is typically hand held or on a tripod.
Usually this type of photogrammetry is used in non-topographic applications.
Consumers-grade cameras are used to model buildings, engineering structures,
vehicles, forensic and accident scenes, film sets, etc. |
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Last updated: 2/26/08 - Comments and suggestions
welcome - webmaster |
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