The database as a collection of non-redundant data in a computer organized so that it can be update, retrieved, and share by various users.
The GIS database can be thought of as a representation or model of real-world geographical system.
- Geographic entity - an element of real world system contained in geographical space, i.e. town, highway.
- Object - a GIS representation of geographic entity, e.g. point, line, area, attribute and non-spatial.