Sebastian,<br><br>you are right. Most GSM cells are directionals. <br><br>one example:<br><a href="http://realtimeblog.free.fr/cell_map.php?mcc=208&mnc=1&lac=16384&cellid=6317&display=Display">http://realtimeblog.free.fr/cell_map.php?mcc=208&mnc=1&lac=16384&cellid=6317&display=Display</a><br>
<br>I do not calculate the cell direction (even though I have<br>already seen a paper with a methodology to calculate the cell<br>tower position from the kind of gsm/gps datas we are gathering...)<br><br>I do not know about the 550m distance you are talking about.<br>
<br>In my opinion, the cell tower position is less important<br>than the cell position openBmap is providing. It gives you a more<br>precise position than the cell tower position.<br><br>About OSM, I have found<br><br><a href="http://wiki.openstreetmap.org/index.php/Proposed_features/Communications_tower">http://wiki.openstreetmap.org/index.php/Proposed_features/Communications_tower</a><br>
<br>regards,<br>Nick<br><br><div class="gmail_quote">2009/1/12 Sebastian Reichel <span dir="ltr"><<a href="mailto:elektranox@gmail.com">elektranox@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">On Mon, Jan 12, 2009 at 09:10:06PM +0100, Nick wrote:<br>
> mcc/mnc/lac/cid and two double for latitude and longitude<br>
</div>> (and perhaps other attributes such as max radius...)+<br>
<br>
You should save the direction the antenna shows into. I had a look<br>
at the gsm antennas in my region and there are always 2-3 fixed on<br>
one tower. Each of them show in their own direction and have a<br>
different CID. At my home I'm often connected to a tower which<br>
distance to me is bigger than the distance of another tower - though<br>
the further afar tower is oriented almost directly to my house and<br>
the other one is not. In your data the 550m distance steps to<br>
the antenna is also not used as far as I have seen it. This is<br>
important data!<br>
<br>
P.S.: In my opionion it would be nice to have this data in OSM, too.<br>
There are already the towers for electricity (gsm antennas are often<br>
fixed on them in Germany (at least in Oldenburg)) - And one can easily<br>
get them out of the data again.<br>
<font color="#888888"><br>
-- Sebastian Reichel<br>
</font><br>-----BEGIN PGP SIGNATURE-----<br>
Version: GnuPG v1.4.9 (GNU/Linux)<br>
<br>
iEYEARECAAYFAklrx2IACgkQH0JwilpTmKhhDACcC/CN6i+V1/gr7bo78RVzfCSd<br>
pi4AniXfbi0Gx5PuNw7yVzXe15nelg+w<br>
=pgVX<br>
-----END PGP SIGNATURE-----<br>
<br>_______________________________________________<br>
devel mailing list<br>
<a href="mailto:devel@lists.openmoko.org">devel@lists.openmoko.org</a><br>
<a href="https://lists.openmoko.org/mailman/listinfo/devel" target="_blank">https://lists.openmoko.org/mailman/listinfo/devel</a><br>
<br></blockquote></div><br>