The Application and Research of an Improved Event-based Spatio-Temporal Data Model

摘要

By analyzing the characteristic and limitations of several typical spatio-temporal data models, the extension methods of improvement are presented for an event-based spatio-temporal data model in the paper. This model takes the current geographic state as the base, quickly recovers the spatial data of any past time. Because recording the changes of spatial objects and cause of changes, model can query spatial objects' historical data (geometric and thematic) and reason the changes of spatial objects. Separate storage and management of spatial data, thematic data and time is effective in reducing storage space and redundancy of data, improve the efficiency of query. Model can be implemented on object-relation database or extending static GIS database. An example about land subdivision is adopted to realize the data model. The instance indicates this model can quickly recover regional state, query time, space and attribute mutually.