New Spatial Query Language Based on GIS

At present,the mainstream of spatial query languages are extended from SFA SQL or SQL / MM Spatial,two international standards.All these two standards for spatial query and spatial analysis are function style.When search conditions increase,function style language will become too complex to be used by normal user,and too inefficient to execute.In this paper,a new spatial query language,Semantic Query Description Language for Geography (SQDL-G),based on GIS was proposed.The language converts spatial predicates into spatial operators and introduces sub-query structure.An execute engine of this language was built up based on ArcGIS platform.Experiments showed that this language has an expression of a flexible,clear structure,and easy to user acceptance.