AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  J2ME location API (JSR 179) on non-GPS devices - how realisi          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message Guest Posted: Thu May 17, 2007 6:22 pm    Post subject: J2ME location API (JSR 179) on non-GPS devices - how realisi Hi all, couple quick questions - I have been playing with the Location API - "in theory" it can use a number of sources to provide location based info but I wonder, in reality - how truly useful is it on non-GPS enabled devices? MUST the phone company provide the information via a becon or something or can the API infer a location based on simple data provided as standard during connection to any cell (I dont know what handshaking goes on during moving from one cell to another)..... Secondly - I have a GPS enabled phone but am a bit wary of just goofing about with code on it. I assume the JVM protects the devices from any possible harm via broken code but I imagine it would be easy to drain the battery REAL fast via a broken Midlet - but is that the worst "damage" I could expect? thanks guys for any pointers :-) G Back to top Patricia Shanahan Guest Posted: Thu May 17, 2007 6:40 pm    Post subject: Re: J2ME location API (JSR 179) on non-GPS devices - how rea gavin@my-deja.com wrote: Quote: Hi all, couple quick questions - I have been playing with the Location API - "in theory" it can use a number of sources to provide location based info but I wonder, in reality - how truly useful is it on non-GPS enabled devices? MUST the phone company provide the information via a becon or something or can the API infer a location based on simple data provided as standard during connection to any cell (I dont know what handshaking goes on during moving from one cell to another)..... Non-GPS geolocation is a subject of active research in the ubiquitous computing community. The Placelab project, http://www.placelab.org/, is a good starting point for finding out more. Most current papers on this topic reference one or more of the Placelab papers. The phone hardware knows the identity and signal strength for each within-range cell phone tower, which is sufficient for approximate location. However, the phone companies tend not to make the information very conveniently available - I think perhaps they would rather have everyone pay for them to tell us where we are. Patricia Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> Java Help All times are GMT Page 1 of 1   Jump to: Select a forum Java Newsgroups----------------Java DiscussionsWeb-based java games comp.lang.java 3D Graphics API's for Java Java: Support and criticism Java System Announcements comp.lang.java.api JavaBeans Java and CORBA Java and Databases comp.lang.java.developer Java GUI Toolkits Java Help comp.lang.java.javascript JVM, native methods and hardware comp.lang.java.misc Java Language Programming Security and Java comp.lang.java.setup Java Software Tools comp.lang.java.tech ibm.software.java.linux  Non-English Java Newsgroups----------------Java Language (German)Language Java (Français)Java (Italian)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.