An aerial photograph from which distortions owing to camera tilt and ground relief have been removed. An orthophotography has the same scale throughout and can be used as a map.
Aerial photography is often used as a cartographic data source for basemapping, locating geographic features, and interpreting environmental conditions.
The representation of continuous elevation values over a topographic surface by a regular array of z-values, referenced to a common datum. DEMs are typically used to represent terrain relief.
An integrated collection of computer software and data used to view and manage information about geographic places, analyze spatial relationships, and model spatial processes.