[Standards] [mobile] [Fwd: Proposed XMPP Extension: Location Query]

Peter Saint-Andre stpeter at stpeter.im
Tue Nov 4 16:07:51 CST 2008


Simon Tennant wrote:
> Stephen Pendleton wrote:
>> Very cool. 
>> Question for the authors: Are you really using arc-minutes as units of the
>> GPS error or is that carryover from the GEOLOC XEP?
> 
> Props should go to Helge for the spec. I guess that writing
> specifications for unmanned aerial vehicles is finally paying off.
> 
> I presume you are referring to this post:
> http://mail.jabber.org/pipermail/standards/2008-October/019920.html
> 
> Arc-minutes are a carry over.  We wrote the spec with XEP-0080 in mind
> and use that as the format for publishing the derived location to the
> user's geoloc node too.
> 
> We would prefer to use accuracy in meters. While arc minutes may make
> sense in a GPS sense, accuracy often has to be implied when using other
> location means.
> 
> For example, if the server is receiving Cell-ID beacons and some of the
> known beacons are identified as within a city an accuracy of 100m could
> be implied due to a known higher tower density. Trying to apply
> arc-minutes to this would probably end up just being clumsy and it would
> be nice to use the same unit of measurement for accuracy.

So use the new <accuracy/> element, which measures in meters:

http://xmpp.org/extensions/xep-0080.html#format

Peter

-- 
Peter Saint-Andre
https://stpeter.im/



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