The Improved Event-based Spatio-temporal Data Model
Cheng Changxiu · Geo-information Science · 2006
This paper reviewed the state-based spatio-temporal data model and the event-based spatio-temporal data model. The state-based spatio-temporal data model doesn't explicitly describe the change procedures of the map, and so does the event-based data model proposed before. To fully record the procedures of the spatio-temporal change and make it easy to query the spatio-temporal change information, an improved event-based spatio-temporal data model based on raster data was proposed here. In this improved model, the changes of the phenomena were fully recorded, and the present state of the map was set as the base map. In many applications, users fetch the present state of the map more frequently, so the improved model would make the system more efficient. In order to show its advantages that it is easy to get the changed information, this paper gave some spatio-temporal query cases. These cases illuminated clearly how to query what happened to the map at any time, such as: what event happened at a location; where did an event happen, etc. Also, this paper discussed the storage efficiency of the data model. And as a conclusion, it was suggested that the model is more suited for some conditions.