Accuracy of location data

Every coordinate has an accuracy, a number between 0 and infinite (theoretically) indicating the region where the coordinate is recorded and the mobile device actually is.

The horizontal accuracy radius is expressed in meters of this location at the 68th percentile confidence level. This means that there is a 68% chance that the true location of the device is within a distance of this uncertainty of the reported location. Another way of putting this is that if a circle with a radius equal to this accuracy is drawn around the reported location, there is a 68% chance that the true location falls within this circle.

Most coordinates are between 15 and 25 meters with coordinates ranging from 0 to 50m being kept for further modelling. Other coordinates are removed from the dataset.