关键词: 时空变化, 地理事件模型, 空间数据主动更新, GECA规则

Abstract: 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.

Key words: spatio-temporal variations, geographical event model, spatial data active updating, GECA rules