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Article #177Re: NEWS: Google accused of criminal intent over StreetView data
From: Bob
Date: Fri, 11 Jun 2010 07:33
Date: Fri, 11 Jun 2010 07:33
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2980 bytes
On 11/06/2010 03:16, John Navas wrote: > FYI, business grade GPS is quite accurate even while moving, on the > order of a few feet. Even my new wrist GPS can manage that. > And how do you know? Have you actually gone to known reference point and taken several readings or do you assume the adverts are correct? "The declaration of the accuracy by Garmin GPS receivers often leads to confusion. What does it mean if the receiver states an accuracy of 4 m? This readout refers to the so-called 50 % CEP (Circular Error Probable). This means that 50 % of all measurements are within a radius of 4 m. On the other hand, 50 % of all measured positions are outside of this radius. Furthermore, 95 % of all measured positions are within a circle of twice this radius and 98.9 % of all positions are within a circle of 2.55 the radius. In the given example, nearly all positions are within circle with a radius of 10 m. The determined position is in the worst case accurate to 10 m." <http://www.kowoma.de/en/gps/accuracy.htm>
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