Patent ID: 8990011
Filing Date: 2015-03-24
Classification: G01C,G01S,H04W

Abstract:
1. A method comprising: under control of one or more processors configured with computer-executable instructions: estimating, by the one or more processors, an area within which a starting location of a user device is located at a first time; identifying, by the one or more processors, a plurality of candidate locations within the estimated area, each candidate location representing a potential starting location of the user device at the first time; receiving, by the one or more processors, map information of a surrounding area of the user device, the surrounding area including the estimated area; determining, by the one or more processors, a movement of the user device starting from the first time; and filtering out one or more of the plurality of candidate locations as potential starting locations of the user device in response to determining that the movement of the user device from the one or more of the plurality of candidate locations would result in one or more corresponding locations that are inaccessible to the user device based on the map information.