Patent Document ID: 8868335
Application ID: 13392552
Patent Flag: 1

Claim One:
1. A computerised method of creating map data, comprising: processing, using a processor, sets of position data derived from the positions of a plurality of mobile devices moving along a section of road having two or more lanes with same direction of travel, wherein each set of position data comprises a plurality of points representative of the position of a mobile device over a period of time, and wherein the processing of a set of position data comprises: determining an offset value for each point, the offset value being the distance between the point and a predetermined reference line; and determining a variance of the offset values for the points in the set; filtering the sets of position data by removing or reducing the weight applied to sets of position data having a variance above a predetermined value to generate filtered position data, said filtering further comprising comparing altitude information associated with one or more points in the sets of position data to a previously determined height for the one or more points, and removing or reducing the weight applied to sets of position data if the altitude information varies by more than a predetermined amount from the previously determined height; deriving information about lanes of the road based upon the filtered position data; and generating map data using the derived information.