Spatial Data Types for Database Systems : Finite Resolution Geometry for Geographic Information Systems Database research in the last decade has increasingly focused on providing support for non standard applications. One important domain is representation and processing of spatial information needed e.g. in geographical information systems. Spatial data types provide a fundamental abstraction for modeling the structure of geometric entities their relationships properties and operations. This monograph is an extensive survey of this field and introduces a new general sophisticated framework for the formal definition and robust implementation of spatial data types