Posts Tagged ‘w3c’

* Mobile Geolocation Implementations

Posted on August 19th, 2010 by Dave Johnson. Filed under Uncategorized, phonegap.

Today I found some time to take a look at the various mobile implementations of geolocation.

Below is a table showing the properties that the geolocation API uses on the various platforms. The W3C geolocation API for browsers specifies a PositionOptions interface that requires a maximum age, timeout and accuracy. Below that row is all of the mobile platforms that we are interested in for PhoneGap and the properties that they support in their native implementations. Some of them support a distance filter that will cause the device to only return geolocation positions if the location has changed by more than that distance while others also support an explicit interval for watching for location changes (note that on Android that interval is only a hint to let the device know how much power to use in getting a location - the position may be reported at an interval either shorter or longer than the specified interval).

I am probably going to be adding these two additional arguments to the PhoneGap PositionOptions and they can be used on platforms that support them.

Max age Timeout Accuracy Distance Interval
BlackBerry maxAge timeout - - interval
iPhone - - desiredAccuracy distanceFilter -
Android - - - minDistance minTime
webOS maximumAge responseTime accuracy - -
WRT updateMaxAge updateTimeout - - updateInterval
Winphone - - DesiredAccuracy MovementThreshold

Image from cloneofsnake

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