Photogrammetry is a technique to obtain 3-dimensional measurements utilizing photographs as the fundamental medium for metrology (measurement).
The term, photogrammetry, was first used by the Prussian architect Albrecht Meydenbauer in 1867 during his work on some early topographic and elevation drawings (Albertz and Wiedemann 1996). The underlying principle used in photogrammetry is aerial triangulation. Photogrammetry relies on taking photographs from at least two different locations, which allows one to develop the “lines of sight” from each camera to points on the object. Further, the lines of sight are mathematically intersected to produce 3-dimensional coordinates of the points of interest.
From an early elementary use in topographic maps and elevation drawings, the applications of photogrammetry have now extended to diverse fields such as geology, engineering, architecture, industry, forensic, forensics, bathymetry, and medicine for the production of precise 3D data.
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