Building information systems for mobile environments
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The advent of wireless technology, such as cellphones, PDAs, tablet PCs, and sub-notebooks, allows transferring portions of traditional, desktop-based GIS technology to mobile environments. This paper introduces Geo-Mobile Query-by-Sketch, a sketch-based spatial querying system for mobile GIS environments that combines techniques for spatial querying with mobile technologies. The system implements an adaptive client-server architecture, which copes with restrictions of mobile environments, such as fluctuating bandwidth and frequent disconnections. The core concept analysed is the mobile sketch, a multi-representation data structure of a sketched scene, which enables an adaptation strategy that is tailored to the available transmission rates. We analyse the transmission cost of Geo-Mobile Query-by-Sketch and develop a protocol that optimises the adaptation level in order to guarantee quality of service.