Hierarchical Semantic Constraint Model for Focused Remote Sensing Information Services

The challenge of remote sensing information service is complex in user demand,rich in data dimension,diversified in sensor types,complicated in processing and time-varying in network,which makes intricate in semantics.Therefore,we propose a hierarchical semantic constraint model as a uniform semantics description model with four levels including user semantic constraints,data semantic constraints,process service function semantic constraints,and process service quality semantic constraints.These constraints act role of establishing the connection between user semantics and data services and processing services,and of the basic of semantic reasoning in service discovery,selection,and composition.