[Talk-ca] GPS inaccuracy

[Pierre Béland]

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 



>________________________________
> De : Tom Taylor <tom.taylor.stds at gmail.com>
>À : 'Talk-CA OpenStreetMap' <talk-ca at openstreetmap.org> 
>Envoyé le : Dimanche 18 novembre 2012 10h43
>Objet : [Talk-ca] GPS inaccuracy
> 
>I had a frustrating experience last night, sorting out an area in my neighbourhood. I laid down a GPS track totalling some 4 km. The whole track was about 10 meters to the west of the Bing and Canvec data already in place. North-south accuracy varied, but wasn't anywhere near so bad.
>
>It doesn't seem worth uploading my track, though maybe I should investigate some more.
>
>Tom Taylor
>
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