ABSTRACT
While a geographic data set is defined as a representation of some part of the Earth' s surface, many other types o f information also refer to specific places on the Earth' s surface, and yet are not normally included in discussions of geographic databases. They include reports about the environmental status of regions, photographs of landscapes, guidebooks to major cities, municipal plans, and even sounds and pieces of music. All of these are examples of information that is geographically referenced, or georeferenced for short, because it has some form of geographic footprint. Clearly geographic information is by definition a subset of georeferenced information.
