Three different databases for gsm celltower locations

[Joerg Reisenweber]

Am Sa  4. April 2009 schrieb Stefan Schmidt:
> OpenBmap likes to have more fields
> for quality informations about GPS and GSM. 

I strongly suggest to include fields for TimeAdvance values for each BTS.
TA is a much better and more reliable value for distance to Base Transmitter 
Sation than dB signal strength.
See:
http://lists.openmoko.org/pipermail/openmoko-kernel/2008-April/002434.html
and
http://lists.openmoko.org/pipermail/openmoko-kernel/2008-June/002987.html

cheers
jOERG
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