We analyze the spatio-temporal characteristics of GIS, introduce the cellular automata, propose a formal definition of spatio-temporal ontology and a method based on spatio-temporal semantic granularity, and discuss an integrated GIS architecture based on ontology and semantics.

Aiming at the limitation of the time ontology in existence that they are lack of basic theory of ontology,the paper put forward the idea of building time ontology based on role and relation after the analysis of the axiom of the concept in the time ontology,and distinguish the role concept explicitly which can solve the potential problem of semantic disordering.