Abstract: A system for correlating drive information from multiple road segments is disclosed. In one embodiment, the system includes memory and a processor configured to receive drive information from vehicles that traversed a first road segment and vehicles that traversed a second road segment. The processor is configured to correlate the drive information from the vehicles to provide a first road model segment representative of the first road segment and a second road model segment representative of the second road segment. The processor correlates the first road model segment with the second road model segment to provide a correlated road segment model if a drivable distance between a first point associated with the first road segment and a second point associated with the second road segment is less than or equal to a predetermined distance threshold, and stores the correlated road segment model as part of a sparse navigational map.

Abstract: A method and apparatus of a device that computes the total tax cost difference between an actual client portfolio and a model portfolio is described. In an exemplary embodiment, the device receives client data corresponding to the actual portfolio and model data corresponding to the model portfolio. The device further computes the total tax cost difference between the actual portfolio and the model portfolio. To compute the total tax difference, the device computes a plurality of individual tax cost differences during a comparison time period between positions of a plurality of securities in both the actual portfolio and the model portfolio and sums the plurality of individual tax cost differences to give the total tax cost difference. In addition, the device stores the total tax cost difference in storage.