Abstract: Methods, systems, computer-readable media, and apparatuses for determining location are presented. One example method includes obtaining a route comprising an ordered set of waypoints; receiving an indication of traversal of the route beginning at a first waypoint and recording a time associated with the indication; determining location information and time information at a sampling rate; for each subsequent waypoint of the ordered set of waypoints: receiving a signal indicating arrival at a current waypoint of the ordered set of waypoints, determining a time and a ground truth associated with the signal, and determining error information associated with each determined location between the prior waypoint and the current waypoint; and providing the error information to a remote device.

Abstract: Systems, apparatus and methods for populating and using a pressure database to determine an altitude of a unit with an unknown altitude are presented. A pressure from one or more barometric pressure sensors linked to respective base stations are interpolated to determine a reference pressure (e.g., at sea level) at arbitrary coordinates (x,y) having pressure reading. For example, a mobile station at the arbitrary coordinates (x,y) records a pressure at the mobile station. A difference between this pressure at the mobile station and the interpolated reference pressure is determined, which may directly be interpreted as a defined altitude of the mobile station.

Abstract: Methods, systems, computer-readable media, and apparatuses for determining location are presented. One example method includes obtaining a route comprising an ordered set of waypoints; receiving an indication of traversal of the route beginning at a first waypoint and recording a time associated with the indication; determining location information and time information at a sampling rate; for each subsequent waypoint of the ordered set of waypoints: receiving a signal indicating arrival at a current waypoint of the ordered set of waypoints, determining a time and a ground truth associated with the signal, and determining error information associated with each determined location between the prior waypoint and the current waypoint; and providing the error information to a remote device.

Abstract: Method and system for providing information of an access point database are disclosed. In one embodiment, a method of providing information of an access point database comprises receiving a request to access an access point database from a mobile client, generating a segment of the access point database in accordance with at least an application requirement of the mobile client, and providing the segment of the access point database to the mobile client. The application requirement of the mobile client comprises precision level requested by the mobile client, and cache level of the mobile client. The method of generating a segment of the access point database comprises at least one of: generating the segment of the access point database in real-time, and providing the segment of the access point database previously generated and stored in the access point database.

Abstract: Systems, apparatus and methods for populating and using a pressure database to determine an altitude of a unit with an unknown altitude are presented. A pressure from one or more barometric pressure sensors linked to respective base stations are interpolated to determine a reference pressure (e.g., at sea level) at arbitrary coordinates (x,y) having pressure reading. For example, a mobile station at the arbitrary coordinates (x,y) records a pressure at the mobile station. A difference between this pressure at the mobile station and the interpolated reference pressure is determined, which may directly be interpreted as a defined altitude of the mobile station.

Abstract: Method and system for providing information of an access point database are disclosed. In one embodiment, a method of providing information of an access point database comprises receiving a request to access an access point database from a mobile client, generating a segment of the access point database in accordance with at least an application requirement of the mobile client, and providing the segment of the access point database to the mobile client. The application requirement of the mobile client comprises precision level requested by the mobile client, and cache level of the mobile client. The method of generating a segment of the access point database comprises at least one of: generating the segment of the access point database in real-time, and providing the segment of the access point database previously generated and stored in the access point database.