IBM - ČVUT Student Research Projects

Mobile Public Transportation Timetables

Petr Podhorský (podhop2@fel.cvut.cz)Jakub Zahradník (zahraj2@fel.cvut.cz)

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Goals• Create mobile application for

downloading timetables of public transportation for nearest stations

• Determine user location by GPS• Provide map of nearby stations• Supply simplified timetables to a user

through mobile UI• Reduce amount of transferred data• Implement in Java

Location• Location API (JSR-179)

– Location API provides transparent location services, based on GPS, BTS triangulation etc. (depends on provider)

– OS Windows Mobile doesn‘t support this package

• Direct connection to GPS module– Application can connect to any device

supporting NMEA 0183 protocol– Internal GPS module, external module

connected by Bluetooth

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Timetables• Timetables downloaded from http://jizdnirady.idnes.cz/

• HTML output parsed by application• Information provided for tram stop(s)

– Time of departure– Name– Next station name– End station name

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Maps

• Maps downloaded from Google Maps

• Converted to PNG format• User position and selected

station marked

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Architecture

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• Application consists of two separated components (both of them are implemented in Java)

• Instead of downloading all data directly from client (~200 KB and more), GPS coordinates are passed to the server, processed and only small amount of data (~2 KB) sent back – with information to display

Conclusion• Easy to use application created• Amount of transferred data significantly reduced• Application tested in real environment -> video

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Questions & Answers

Thank you for your attention.

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