A Study of Dynamic Database in Mobile GIS
Ka-wai Kwan, Wenzhong Shi · 2002
Wireless Internet is one of the fastest growing areas in the information economy, and as a result, location-based services have undergone explosive growth. In mobile computing, considerable research has been focused on the infrastructure and architecture design to try and solve system bottlenecks, such as the development of third generation mobile systems or to resolve cache management of the database. The database design, however, is an essential issue that must be considered. This paper introduces a new conceptual model for a spatial temporal data set for mobile GIS and explores the creation of a dynamic database. The database is updated continuously to reflect the real situation, and captures the movement of a mobile user. The goals are to fine-tune the original database and thus provide the latest and accurate information for mobile users with a limited communication bandwidth and to improve the response time. Issues of spatial temporal data integration in mobile databases, how they work and performance for real time applications and on-line queries are discussed. We assume that the spatial information is in a simplified structure with only one temporal dimension; the GIS are developed based on a relational database.