Photogrammetry is the science of obtaining accurate measurements and three-dimensional information from photographs. It involves analyzing photographs and extracting measurements of objects and their environments from them. The technique is used in a variety of fields, including surveying and mapping, architecture, engineering, archeology, and forestry.
Photogrammetry works by analyzing the position and orientation of features in multiple photographs of the same object or scene. By analyzing the differences in position and orientation between the photographs, the software can triangulate the position of features in three dimensions, creating a digital model of the object or scene.
There are two main types of photogrammetry: aerial photogrammetry and terrestrial photogrammetry. Aerial photogrammetry involves using photographs taken from aircraft or drones to create three-dimensional models of the ground or objects on it, while terrestrial photogrammetry involves using photographs taken from ground-level positions to create three-dimensional models of objects or scenes.