The Photogrammetry is a 3-dimensional coordinate measuring technique. It uses photographs as the fundamental medium for metrology (or measurement). The principle used by Photogrammetry is triangulation or more specifically called Aerial Triangulation.
By capturing photographs from at least two different locations, the “lines of sight” can be developed from each camera to points on the object. These lines of sight are mathematically intersected to produce the 3-dimensional coordinates of the points of interest.
The term photogrammetry was made use of by the Prussian architect Albrecht Meydenbauer in 1867 for the first time, who fashioned some of the earliest topographic maps and elevation drawings.
Digital Photogrammetric Mapping in topographic mapping is well established. But, in the current times, the technique has been extensively applied in the fields of architecture, industry and many others for the production of accurate 3D data.
What Are The Branches of Photogrammetry?
Metric - It deals with the exact measurements and computations on photographs regarding the size, shape, and position of photographic features. These photographs are taken with the help of a metric camera and are mostly used in the engineering fields.
Interpretive - It deals with the identification of the photographic features on a photograph such as shape, size, shadow, pattern, etc. It helps to add value to the information.
Photogrammetry has always presented a very significant “business proposition”, for several reasons:-
- It is cost-effective - LiDAR equipment is costly and needs specialized expertise to operate properly. Photogrammetry requires only a DSLR camera and software that can be run on a standard computer.
- It is easily available - Photogrammetry equipment can fit in the back of any surveyor’s truck, and you can operate it yourself.
- It is multipurpose - Photogrammetry technology has evolved to the point where it’s a great general-purpose imaging tool.
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