一种面向对象的GIS时空数据模型

New object-oriented spatio-temporal data model

为了更加自然地描述时空对象、再现历史时刻下的时空对象的空间状态和拓扑关系,采用面向对象的方法组织和管理时态地理信息系统(temporal GIS,TGIS)中的地理数据,即任何地理目标都可以看作时空对象,它们都有自己的生存期和行为方式,地理目标之间通过关联关系进行联络。结果表明:利用时空对象的继承性和重用性,可以灵活地构建复杂地理对象;利用暗示型的时空对象关联,可以有效简化时空数据拓扑关系的管理和维护;利用时空对象的查找、构建算法,可以方便地再现任意历史时刻下时空对象的存在状态。

The key issue of temporal GIS （TGIS） is to design an appropriate data model that can illustrate and describe historical objects dynamically. Based on the object-orientated principle, everything in nature can be considered as object. Spatio-temporal object has life span and behavior and can communicate with others through corelations. Making use of heritage and template, we can create any compound spatio-temporal objects. This paper integrates object-orientated principle into TGIS data model, presents the implicit corelation method through which we can maintain the spatio-temporal topology, query the status of spatio-temporal objects at any time.