The object-oriented approach is a powerful tool for modelling the real world. It allows a description of the spatial and attribute data of a geographical object, and encapsulated methods at the same level. By incorporating the abstraction mechanisms such as generalisation and aggregation, it can be very efficient tool for application designers to model complex geographic situations. The aim of this paper is to illustrate how such approach could be modelled within a geographical information system (GIS) in which a spatial database is represented in a raster quadtree structure.
