A Spatio-temporal Data Model for Digtial Real Estate System
Cai Yangjun · Geo-information Science · 2006
Temporal data management is very important to Digital Real Estate System(DRES),how to build a spatio-temporal data model is a key issue of DRES.This paper firstly analyzes the characteristic of temporal data and draws a conclusion that change of spatial information is much lower than that of attribute information. According to this, a new Spatio-temporal Data Model of DRES was constructed, which is named as ameliorated model with combination of sequential snapshot model and base state with amendments model. This model is easy to be implemented with less storage in information system. According to this spatio-temporal model with workflow cared, DB Trichotomy Method has been implemented in DRES. According to DB Trichotomy, Temporary DB, Formal DB and History DB are defined to store data in three states. The spatio-temporal data in this paper has been used in Hangzhou Digital Real Estate Information System.