This can be related to altitude, the position of a road or bridge, the type or state of vegetation at a given point, or statistical information such as an average temperature in a particular region. This information is created from terrain assessments (physical measurements, surveys, etc.) as well as, very often, from the analysis of space-based or aerial imagery. It is made available in the form of digital databases which are used to produce maps or which are processed by specific software according to the kind of application for which the geographic information is required.