I believe some of the high-end navis have a built in gyrosensor to take over when no GPS is available (i.e. in a tunnel). Apparently these don't work too well (yet) as driving not absolutely smooth confuses them… and I have yet to see one underground train that goes smooth :) But well, one day this might offer something better that just pure guessing, even if it isn't 100% accurate :)
Greetings xeen On Tue, Aug 26, 2008 at 12:07, Dave Stubbs <[EMAIL PROTECTED]> wrote: > On Tue, Aug 26, 2008 at 10:27 AM, Kenneth Gonsalves > <[EMAIL PROTECTED]> wrote: >> >> On 26-Aug-08, at 2:29 PM, Thomas Wood wrote: >> >>> b) The Underground/DLR/Tram lines are complete >> >> how did you do the Underground? >> > > > Extrapolated between the tube stations mostly I think. > > Some of the "cut and cover" lines have been traced from aerial imagery > and on-the-ground observations (they have a visible surface > "footprint" due to the construction method, and the fact that you > can't easily build big buildings on top of them). The deep lines are > pure guess work, with a little artistic license to make the lines nice > and curvy. > > Most of the underground isn't actually underground, so that part is easy! > > Dave > > _______________________________________________ > newbies mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/newbies > _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
