This paper researches the basic principle of fuzzy retrieval on multimedia data semantics, designs a fuzzy reasoning mechanism of Agent knowledge base, puts the fuzzy algorithm wich reasoning is forward or backword,and relevant implementation is presented as well.

This paper deals with the semantic data access on demand in the grid environment and proposes a novel ontology-based semantic data fusion method named OSDF.

Form the perspective of semantics, GIS is a symbolic system in the logistical formalism, and GIS semantics can be understood as spatial conception represented by the GIS.