Who said Bing and/or Canvec are accurate?
On 18 November 2012 19:31, Tom Taylor <tom.taylor.s...@gmail.com> wrote: > Mostly the buildings were two stories only. A high-voltage transmission > line runs behind them, the width of the buildings and more away, but maybe > it had some effect. > > > On 18/11/2012 11:23 AM, Pierre Béland wrote: > >> Tom >> >> You can try to repeat the experience with this same GPS and compare your >> results. >> >> I dont know if this is the case for your. In urban areas, the tall >> buildings are obstacles to Satellilte signal. This increases the inaccuracy >> of GPS measurement. If you are close to a tall building, you wont receive a >> good signal from that direction. Your position is calculated with a >> principle of triangulation. You >> need to receive the signal fo at least three satellites. And results are >> far better with four. >> >> >> >> Pierre >> >> ... > > > ______________________________**_________________ > Talk-ca mailing list > Talk-ca@openstreetmap.org > http://lists.openstreetmap.**org/listinfo/talk-ca<http://lists.openstreetmap.org/listinfo/talk-ca> > -- Gregory o...@livingwithdragons.com http://www.livingwithdragons.com
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