Sebastian, you are right. Most GSM cells are directionals.
one example: http://realtimeblog.free.fr/cell_map.php?mcc=208&mnc=1&lac=16384&cellid=6317&display=Display I do not calculate the cell direction (even though I have already seen a paper with a methodology to calculate the cell tower position from the kind of gsm/gps datas we are gathering...) I do not know about the 550m distance you are talking about. In my opinion, the cell tower position is less important than the cell position openBmap is providing. It gives you a more precise position than the cell tower position. About OSM, I have found http://wiki.openstreetmap.org/index.php/Proposed_features/Communications_tower regards, Nick 2009/1/12 Sebastian Reichel <elektra...@gmail.com> > On Mon, Jan 12, 2009 at 09:10:06PM +0100, Nick wrote: > > mcc/mnc/lac/cid and two double for latitude and longitude > > (and perhaps other attributes such as max radius...)+ > > You should save the direction the antenna shows into. I had a look > at the gsm antennas in my region and there are always 2-3 fixed on > one tower. Each of them show in their own direction and have a > different CID. At my home I'm often connected to a tower which > distance to me is bigger than the distance of another tower - though > the further afar tower is oriented almost directly to my house and > the other one is not. In your data the 550m distance steps to > the antenna is also not used as far as I have seen it. This is > important data! > > P.S.: In my opionion it would be nice to have this data in OSM, too. > There are already the towers for electricity (gsm antennas are often > fixed on them in Germany (at least in Oldenburg)) - And one can easily > get them out of the data again. > > -- Sebastian Reichel > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (GNU/Linux) > > iEYEARECAAYFAklrx2IACgkQH0JwilpTmKhhDACcC/CN6i+V1/gr7bo78RVzfCSd > pi4AniXfbi0Gx5PuNw7yVzXe15nelg+w > =pgVX > -----END PGP SIGNATURE----- > > _______________________________________________ > devel mailing list > devel@lists.openmoko.org > https://lists.openmoko.org/mailman/listinfo/devel > >
_______________________________________________ devel mailing list devel@lists.openmoko.org https://lists.openmoko.org/mailman/listinfo/devel
