Aerial photogrammetry is the science of obtaining accurate geometric measurements using photographs taken from an aerial platform. It includes aerotriangulation, or block adjustment of multiple photographs using point of common detail normally derived from Real Time Kinematic (RTK) satellite navigation and airborne Global Positioning System (GPS).
Aerotriangulated stereo images is the 3D base product from which a number of 2D and 3D products are derived.
Orthophotos are generated from overlapping vertical aerial photographs and processed to remove perspective and the effect of the terrain. Orthophotos are a fundamental base layer for Geographic Information System (GIS) databases.
Planimetric maps, point clouds, contours and features also can be generated from aerotriangulated aerial imagery.