Improved Event-Process Based on Spatiotemporal Model

Event can represent semantic meaning of spatiotemporal changes,but hardly illuminate detail operations of inner alteration and represent continual or more complex changes.The authors analyzed the scale and subdividable characters of event and relationship between event and process.An improved event-process based spatiotemporal model(E-PSTM) is proposed,in which view event is composed of some processes.There are three types of changes,disperse,linear and nonlinear,and process operations are divided into creation,alteration,maintenance and so on.The logical structure of E-PSTM with object-oriented method is designed,and it is applied to cadastral alteration system.It can be efficiently queried and backdated the events,processes and semantic information about parcel spatiotemporal change.