Debi,

Can you tell me more about the python script for revealing the cellid lat/long. Is this for a particular implementation or phone?

Do you know of any availability of this data on Windows Mobile 5 smartphones/pocketpcs?

Kevin

On Apr 12, 2006, at 1:37 PM, Debi Jones wrote:

Dan those are GPS solutions.  Nextel and Boost Mobile who have deployed A-GPS also provide cellid as a fall back.  There are 2 other distinctions for GPS determined location and those are Quick Fix or Full Fix.  Full Fix is more accurate, but takes anywhere from 30 secs to 3 mins to deliver.  A Quck Fix takes at least 10 secs.  You must be outdoors for any of the consumer GPS solutions to return a fix.  I was 3 feet inside a Starbucks and the Boost phone I was using had to revert to cellid.  And if you're mobile trying to get some information a 10 sec wait fills like an enternity.  More times than not the consumer implementation of GPS fails and reverts to cellid which is more useful than no location, but just barely depending on the application.  Enterprise implementations of location services from Sprint and Nextel are much better, but there's substantial revenue in those solutions.

Verizon is in testing with it's location service, but unlikely to make it available to developers before the end of the year.

Other solutions around cellid can be exposed by the user if you have a S60 phone.  You can write or download a python script to reveal the cellid lat, long info already stored in your handset.  There may be some other grassroots solutions for revealing location info already in the handset.

P.S. I dig what you guys at socialight are doing, btw.

...Debi

On 4/12/06, Dan Melinger <[EMAIL PROTECTED] > wrote:
Out of the larger carriers in the US, it's my understanding that Verizon and Sprint are using A-GPS and the GSM guys, T-Mobile and Cingular are using alternative technology like Uplink Time Difference of Arrival (U-TDOA) technology provided by TruePosition.

A-GPS requires a chip in the phone while U-TDOA doesn't.


On Apr 12, 2006, at 12:46 PM, Anthony Townsend wrote:

It's the FCC not the FAA, and my understanding is that none of the US
carriers are using tower triangluation (EOTD or other variants) because of
the cost of network upgrades. Instead they are pushing to cost to you, the
consumer, in the form of A-GPS equipped handsets.



[EMAIL PROTECTED] ( [EMAIL PROTECTED]) wrote @ 4/10/06 9:35 AM:

I think this is a great question. I talked to a gentleman from South Africa
last year at Where 2 who claimed to be a GSM expert. He said that GSM can
locate you within something like 3 meters with no GPS support just using
the towers, and that this was built into the GSM spec. He spoke of a case
in South Africa where they located some sort of criminal using the GSM
records.

He said that CDMA on the other hand, cannot locate so precisely.

So, to me, A-GPS was designed to make CDMA users locatable to the same
degree as GSM.

As an aside, does anyone know which type of cell phones are more lethal?

Roger

Original Message:
-----------------
From: Ian | Urban Mapping [EMAIL PROTECTED]
Date: Mon, 10 Apr 2006 01:42:23 -0400
Subject: [Geowanking] E911 // cellular trilateration accuracy


At the risk of asking (another) obvious question, I continue my naïve streak
on this listserv…



I've heard very different reports of how accurate cellphone tracking is—the
FAA mandates something like 50% of calls must be traceable to within a range
of 30m but I've heard some mobile pros say they've heard of it getting as
good as several feet. Obviously this varies depending on geography (urban,
rural, topography), but does anybody have any idea how the US wireless
carriers stack up? And how does this compare to phones with GPS?





Ian White  ::  Urban Mapping LLC  ::   < mailto:[EMAIL PROTECTED]>

120 West 45th Street  20th Floor  ::  New York  NY  10036

Tel.212.242.8267  :: Fax.866.385.8266  ::  www.urbanmapping.com





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