Patent ID: 7440591

Claim:
A method of identifying and correcting errors in information describing terrain features, comprising: obtaining a first set of data describing an area of terrain, the first set of data having a first type of error; obtaining a second set of data describing the area of terrain, the second set of data having a second type of error, wherein the second type of error is characteristically different from the first type of error; comparing a subset of the first set of data corresponding to a first portion of the area of terrain with a subset of the second set of data corresponding to the first portion to identify information, describing a terrain feature, that is not present in one of the first and second sets of data; replacing the subset of the first set of data with the subset of the second set of data when information describing a terrain feature is not present in the first set of data because of the first type of error; and replacing the subset of the second set of data with the subset of the first set of data when information describing a terrain feature is not present in the second set of data because of the second type of error.