面向空间数据主动更新的地理事件模型研究

Research on Geographical Event Model for Spatial Data Active Updating

为提高空间数据更新的自动化水平,提出"地理事件-条件-操作"规则驱动下的空间数据主动更新机制,主动更新的关键是对地理要素时空变化过程进行完整有效地建模和表达。以地理事件作为描述地理要素动态变化和动态处理的概念实体,在概念模型和谓词表达式的基础上重点研究了面向空间数据主动更新的地理事件模型,设计了地理事件模型的数据库逻辑表达框架和事件的检测与存储流程。居民地和道路建模实例表明该模型可有效描述更新过程中实体的动态时空语义,同时兼具历史回溯功能。最后,给出主动更新的应用实例,结果表明该机制可以提高更新的效率。

The authors present the mechanism of spatial data active updating derived by GECA（geographical event-condition-action） rules to improve the level of spatial data updating automatization.Modeling and expressing spatio-temporal variations process of geographical feature is the key of active updating.The geographical event is as a concept entity for describing dynamic changes and dynamic processing of geographical feature.The authors propose a geographical event model for spatial data active updating emphatically based on conceptual model and predication expression,and design the database logical expression frame and the detection and storage flow for geographical event.Proved by the example for settlement places and roads,this kind of model can describe the dynamic spatio-temporal changes of entity in the process of data updating effectively also with the function of history retrospect.At last,the active updating example is presented,the result indicate that the mechanism can improve the efficiency of updating.