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Photogrammetry is commonly defined as the science of making measurements: maps, drawings or 3D models of real-world objects or scenes from photographs. Digital image capturing and photogrammetric processing includes several well-defined stages, which allow the generation of 3D digital models of the object as a result. It is the process of converting 2D photographic images into a computer-generated 3D model after the extraction of reliable information related to the elements to be generated.

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Depending on the camera location during photography, we can work with either Aerial Photogrammetry or Terrestrial (or Close-Range) Photogrammetry. In Aerial Photogrammetry, the camera is attached to an aircraft, a drone, or a UAV as an example, and pointed, usually, towards the ground. In Terrestrial and Close-Range Photogrammetry, known as Image-Based Modeling in the computer vision community, the camera is placed on the ground via a tripod or pole, or simply hand-held.