Patent ID: 8126934
Filing Date: 2012-02-28
Classification: G06F

Abstract:
1. A computing method of updating a database that comprises a geometric representation of a train track and a plurality of offsets corresponding to the geo-locations of features on the train track, the method comprising: converting, by a data-processing system, geo-locations of a first set of points on the train track from latitude/longitude/altitude coordinates to three-dimensional Earth-Centered Earth-Fixed Cartesian coordinates; generating, by the data-processing system, based on the three-dimensional coordinates of the first set of points, a piecewise polynomial spline that is defined in terms of a proper subset S of the first set of points; removing from the database entries corresponding to a second set of points on the train track; and storing, by the database, new entries corresponding to the subset S, wherein each of the new entries comprises: wherein the geometric representation comprises a piecewise polynomial spline.