基于状态和变化的统一时空数据模型

A Unified Spatio-Temporal Data Model Based on State and Change

提出了一个基于状态和变化的统一时空数据模型 SCUDM(state and change based unified spatio- temporialdata model) .时空数据库的状态是关于对象、空间和时间的三元组 ,时空数据库的变化就是状态的变化 .按照对象域、空间域和时间域将时空数据库中的变化分别投影分解 ,显式地表达在对象、空间和时间上的变化 .而事件是在某一时刻前后 ,时空实体的变化关系 ,在事件表达中蕴涵了空间实体之间的时间拓扑关系 .SCUDM不仅支持状态和变化的表达 ,而且支持时间拓扑和空间拓扑的表达 .

In this paper, a unified spatio temporal data model (SCUDM) based on state and change is proposed. A state in spatio temporal database is represented by a ternary tuple about object, space and time. Thus, a change in spatio temporal database is represented by a change over a state, which can be projected to object domain, space domain and time domain separately in order to explicitly represent change over object, space and time. An event in spatio temporal database is a relation of changes about spatio temporal entities, implying the temporal topology of spatio temporal entities. SCUDM model can support both representation of state and change and representation of spatial temporal topology.