Techniques for displaying and caching tiled map data on constrained-resource services
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United States of America Patent
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Jan 1, 2008
Grant Date -
Apr 12, 2007
app pub date -
Aug 11, 2005
filing date -
Aug 11, 2005
priority date (Note) -
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Abstract
Techniques are disclosed that enable users to access and use digital mapping systems with constrained-resource services and/or mobile devices (e.g., cell phones and PDAs). In particular, latency of a mapping application on high-latency and low-throughput networks is minimized. One embodiment utilizes volatile and non-volatile storage of the mobile device to cache pre-computed map images (e.g., map tiles). An asynchronous cache can be used to prevent delays caused by potentially slow non-volatile storage. Meta-data about each map image and usage patterns can be stored and used by the cache to optimize hit rates.
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