Patent ID: 6571195
Filing Date: 2003-05-27
Classification: G01C

Abstract:
A method performed by a computing platform for calculating a distance between a first point and a second point in a geographic region using linear interpolation, the first point and the second point located between a first latitude and a second latitude comprising:providing the first point and the second point to the computing platform; calculating an interpolated prime vertical radius of curvature value for a point between the first point and the second point based on a first prime vertical radius of curvature value for the first latitude and a second prime vertical radius of curvature value for the second latitude; calculating an interpolated meridian radius of curvature value for the point between the first point and the second point based on a first meridian radius of curvature value for the first latitude and a second meridian radius of curvature value for the second latitude; calculating an interpolated cosine value for the point between the first point and the second point based on a value representing a cosine of the first latitude and a value representing a cosine of the second latitude; and calculating the distance between the first point and the second point based on the interpolated prime vertical radius of curvature value, the interpolated meridian radius of curvature value, and the interpolated cosine value.