一种基于对象快照模型的时空查询原子模型

An Atomic Model of Spatiotemporal Query Based on Object-Oriented Snapshot Model

基于对象快照模型,在分析时空对象最基本时空特征的基础上,定义时间范围、空间范围、时空范围、时间关系、空间关系和属性状态6个基本查询元素。在此基础上,以时间为主轴,定义原子查询类型,并提出基于原子类型构造新类型的方法。对基本元素和原子查询的定义不涉及应用级语义,使其具有良好的系统性和适应性;同时具有明确的GIS表达,使其具备可实现性。研究成果可以作为时态GIS中时空查询接口实现的基础和依据。

By analyzing the fundamental spatiotemporal characteristics of spatiotemporal objects, six query primitives, which are temporal range, spatial range, spatiotemporal range, temporal relation, spatial relation and attribute state, are proposed based on object-oriented snapshot model. Centered on time, atomic queries are defined, and approaches to constructing complex queries from these atomic queries are proposed. On the purpose of rendering the proposed query model more systematic and adaptable, application semantics are not considered in defining query primitives and atomic queries. In addition, owing to its clear expressiveness in GIS, the model possesses considerable implementability and can serve as the foundation and basis of implementations of spatiotemporal query interfaces in temporal GIS.