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Designing a Real-Time Mobile GIS
Chen Shanchun and Shi Liangping
Beijing University of Post and Communication, China
csc80@tom.com
Wang Liang
Chinese Academy of Surveying and Mapping
Abstract
Traditionally, most of GIS, GeoDBMS and CAD systems do not require time-critical response. However, resent progress in mobile technology as well as Wireless, location-based services have undergone explosive growth. In mobile computing, gradually change access, update, query and visualization from relatively ‘time-independent’ to ‘time-dependent’ and even ‘time-critical’. The interesting question is then whether the current developments in spatial data management offer sufficient functionality and performance to support time-critical applications.
This paper discusses the requirements to time-critical application and 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 database, how they work and performance for real time application and on-line queries are discussed.
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