Design and implementation of spatial-temporal data model in vehicle monitor system

According to the special features-changed frequently anda large amount of datum-trajectory data in the vehicle monitor system,some methods of trajectory data storage were analyzed.Then a new data model based on space-time cube and manage data by trajectory-version was built up.It was also described how to build thismodel and do some spatial-temporalquery.Experiences show thatthis model satisfy the requirements of application.The storage is reduced and the performance of spatial-temporal query is improved.