Abstract: In certain embodiments, a mobile device includes a sensor, one or more processors, and a memory. The memory stores computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform operations including determining a first geographic location based on wireless signals received as part of a wireless-based mobile device positioning system. The operations include accessing a geographic database that includes data representing a number of geographic locations and properties associated with the geographic locations, and a mapping between measureable values of a type and particular geographic locations. The operations include determining, using the geographic database, candidate geographic locations for adjusting the first geographic location.

Abstract: A system and method are disclosed for a system determining surface types using motion patterns. In an embodiment, the system receives inertial measurements from a sensor of a vehicle operating on a surface of an unknown surface type. The system generates a prediction of a type of the surface based on the inertial measurements. In some embodiments, the system generates the prediction by performing a fast Fourier transform (FFT) operation on the inertial measurements to generate a set of frequency bins that reflect surface features. In other embodiments, the system generates the prediction by inputting the inertial measurements into a trained machine learning model configured to generate the prediction of the surface type. The system provides for display data representing the prediction on a user device. The system may also determine the speed and/or geographic location of the vehicle using the inertial measurements and the surface type prediction.

Abstract: In certain embodiments, a mobile device includes a sensor, one or more processors, and a memory. The memory stores computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform operations including determining a first geographic location based on wireless signals received as part of a wireless-based mobile device positioning system. The operations include accessing a geographic database that includes data representing a number of geographic locations and properties associated with the geographic locations, and a mapping between measureable values of a type and particular geographic locations. The operations include determining, using the geographic database, candidate geographic locations for adjusting the first geographic location.