i) illuminance is the total luminous flux incident on a surface, per unit area
ii) An exposure station is the point at which aircraft is positioned in space with camera for instant of exposure by camera lens.
ili) is an aerial photograph or satellite imagery geometrically.
iv )Photogrammetry is the art, science, and technology of obtaining reliable information about physical objects and the environment through processes of recording, and measuring .
v)relating to or denoting a process by which two photographs of the same object taken at slightly different angles are viewed together, creating an impression of depth and solidity.