Research On Spatio-Temporal Data Model In Temporal GIS

Temporal GIS (TGIS) is the important domains and hot issues in the GIS research. To organize, manage and consummate the temporal geography object's attribute, space and temporal semantics, it is the key to reproduce the historical status, track change and forecast the future. Therefore the spatio-temporal data model is one of the important contents in the Temporal GIS. It has the important theoretical and practical significance to carry out the study of the spatio-temporal data model. The main work and conclusion are as follow in this paper.According to the Temporal GIS and the spatio-temporal data model elementary theory, this paper has analyzed the advantage and shortage of the spatio-temporal data models. To make up the defect, this paper improved and proposed a spatio-temporal data models based on state with amendment. Comparing with the exited spatio-temporal data models, this model can save storage space and improve the resuming speed.On that basis of the data model proposed in this paper, spatio-temporal database was designed, this database is composed of three parts, the first part is the snapshot database, to store a snapshot of the initial state, and the second part is delta-file database, to store the delta-file, and the third part is base state database, to store the base state delta-file.On the basis of the spatio-temporal database, an experimental system has been developed in this paper, this experimental system has achieved history tracking and historical status recurring. So the Applicability of the spatio-temporal data model proposed in the paper and the reasonable of the design of database are verified.