基于事件和版本管理的逆基态修正模型

在TGIS研究中,低冗余时空数据存储和高效率时空操作是一对难以调和的矛盾.基态修正模型及其扩展的研究重点也在于如何调和这对矛盾体.提出了一种基态修正模型的变体,该模型可基于事件和版本管理实现逆向基态修正,并始终以当前现势数据作为基态,以事件记录每次变更的变化量,以版本标识地理对象的时空状态,可完整地记录地理对象的时空演变过程.在历史操作中,利用版本标识与事件管理时空对象生命周期,通过逆向增量获取历史态.通过在土地利用现状数据变更系统中的应用,证明利用事件与增量该模型能简便地实现地理对象的历史回溯与变更回退,利用版本标识可以快速获取历史态.

Model of backwards base state with amendments based on event and version management

Low redundancy storage and high spatial-temporal operation efficiency of spatial-temporal data is a contradiction is TGIS. Researches of base state with amendments and its extensions are made to reconcile the contradiction. This paper proposes a variant of base state with amendments on spatial-temporal data model, which achieves reverse base state with amendments by event and version management. The model always puts the current data as the base state, and makes a record of each change variables by event management. It marks the spatial-temporal state of geographic objects with version management which can make a complete record of the spatial-temporal evolu- tion of geographic objects. And then, it adopts version mark and event to manage the lifecycle of spatial-temporal objects, acquiring the history state by reverse increment in the history operations. With the application in Land Use Current Data Change System, it shows that this model is easy and convenient to realize history trace and change back of geographic objects by event and increment, and to obtain history state instantly by version mark.