Natural-language Querries On Spatial Relations Based On Geographic Entities

With more and more applications of geographic information system in people's daily life, study on the natural-language queries of spatial relations becomes increasingly important.Currently, Scholars focus on natural-language descriptions of spatial relations, formalizing descriptions of natural-language spatial relations, parsing the query sentences , and the interface of natural-language spatial relation query, but they usually abstractly consider the spatial objects as non-geographic geometric objects when they dealing with their spatial relations. However, geographic semantics also take influences when describing spatial relations with natural language due to the characteristics of different geographic entities, so current study on the natural-language queries of spatial relations is hard to get a sound result when it faces to real world geographic objects.In this dissertation, firstly, the operators about the natural-language terms which describe spatial relations are designed according to the rules from former study on formalizing natural-language spatial relations descriptions. At the same time, considering the semantics of geographic objects, this paper sums up some knowledge about how the spatial relations between two different geographic objects which have different geographic characteristics are represented in natural language, and puts forward a method to design a knowledge base. Finally, use the rules in knowledge base and GIS platform to design a query system.