[Talk-ca] GPS inaccuracy

[Gregory]

Who said Bing and/or Canvec are accurate?


On 18 November 2012 19:31, Tom Taylor <tom.taylor.stds at 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
>>
>>  ...
>
>
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-- 
Gregory
osm at livingwithdragons.com
http://www.livingwithdragons.com
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