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Post by sacha » Tue Mar 31, 2015 7:23 am

I was wondering, I used my Xperia Z (A-GPS) with AQ to get data of the field for my masters degree PhD, what is the accuracy of the measurement ? Does the +/- 3 m really mean something scientifically ?



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Re: Accuracy

Post by Psyberia-Support » Tue Mar 31, 2015 9:56 am

Hi and thanks for your interest in our application.
Here is how the Android system define the accuracy, I guess it's the answer you would like:
The estimated accuracy of this location, in meters.

We define accuracy as the radius of 68% confidence. In other words, if you draw a circle centered at this location's latitude and longitude, and with a radius equal to the accuracy, then there is a 68% probability that the true location is inside the circle.

In statistical terms, it is assumed that location errors are random with a normal distribution, so the 68% confidence circle represents one standard deviation. Note that in practice, location errors do not always follow such a simple distribution.

This accuracy estimation is only concerned with horizontal accuracy, and does not indicate the accuracy of bearing, velocity or altitude if those are included in this Location.
Let me know if you need more details.
Best regards
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