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.
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.