Using web-sources for location based systems on mobile phones

摘要: The paper describes the implementation of a context aware location and time based system on normal mobile phone, with minimum requirements (Bluetooth, Internet access, Java ME, simple webbrowser). We can answer following queries data crawled from web enriched coordinates: • Where are my friends? What movies playing, right here, now? I need to park car. is closest parking lot free space? good place have dinner around here? history this building? experiences other people had at location? Similar systems been built, but all in limiting setting (specific hardware/software, specially built devices, limited areas). While many only use their own data, we public sources that be coupled location. This shows it possible fact rather easy build useful kind device which needs most: your phone. challenge for services thus located obtaining valuable information web. used 7 different web-sources, each format. These use-cases indicate systembottlenecks yield set emerging standards data. A full version available http://www.science.uva.nl/~marx/pub/nulaz.pdf.