Patent ID: 6370476
Filing Date: 2002-04-09
Classification: G01S

Abstract:
A method for improving the accuracy of a survey of a region, the method comprising the steps of:determining, a grid of at least three survey reference points in a selected first coordinate system for a selected region; obtaining a set of N survey control locations associated with the region; providing a computer that is programmed: to identify, for each grid point in the grid, an associated survey control set of a selected number K (2&lE;K&lE;N) of survey control locations that are associated with the grid point, and determining a transformation T that has at least one adjustable parameter and that maps location coordinates in the first coordinate system into location coordinates in a selected second coordinate system; for each grid point in the grid, to determining a coordinate difference between at least a first coordinate of the grid point and a corresponding coordinate of the image of the grid point under the transformation T; and to determine a difference interpolation function, defined on and continuous at all points in the selected region, which is approximately equal to the coordinate difference for each point on the grid.