Harald Welte escreveu:
On Mon, Apr 21, 2008 at 05:59:29PM +0800, [EMAIL PROTECTED] wrote:
Am Mo 21. April 2008 schrieb Werner Almesberger:
[EMAIL PROTECTED] wrote:
For many countries there are ageold databases created by hobbyists doing
antenna-spotting. In Germany, carrier O2 sends quite exact Gauss-Krueger
coordinates on CBC 221 for each of his stations.
Okay, that's good. So we can have a comprehensive geographical database
we can put our "GSM n-space" in relation to. (Although no motivation
was ever stated, I'm assuming here that the goal of the whole exercise
is to avoid using GPS. Thus we can't correlate vectors we measure in
GSM n-space to 2D or 3D real-world vectors we measure with GPS.)
Is there something like openstreetmap with these antenna locations or
does one have to hunt and gather from scattered repositories ?
Dunno...
At least in Germany the location of the cellular towers (especially
combined with the information if they're GPRS, EDGE, UMTS or HSDPA) is
considered a trade secret by the operator.
If you create free databases with that kind of stuff, be sure you have
sufficient stack to fight the legal battles.
Here in Brazil the location of all cellular base stations is public, but
there is no cell id/etc on that database; as far as I understand it,
it's just a database of all the licenses from ANATEL (the federal
telecommunications agency) to the carriers. Other than lacking the GSM
identifiers (and in fact whether it's GSM at all), it's fairly complete,
including not only lat/long but also street addresses.
It's located at
http://sistemas.anatel.gov.br/stel/consultas/ListaEstacoesLocalidade/tela.asp?pNumServico=010
--
Cesar Eduardo Barros
[EMAIL PROTECTED]
[EMAIL PROTECTED]
