Patent ID: 8116922

Claim:
A method performed on a computer for resolving errors in a virtual recreation of ground-level activities caused by inaccurate altitude data, comprising the steps of: acquiring using the computer a first acquiring a first set of data points representing a recorded trip of a moving body, wherein each point in said first set of data points comprises information describing an altitude of said moving body at a given point in said recorded trip, applying an on-ground algorithm to said first set of data points to produce a second set of data points, wherein said second set of data points is a subset of said first set of data points, and wherein all points in said second set of data points correspond to known points in said recorded trip when said moving body was operating on the ground, determining an altitude difference between said each point in said second set of data points and an altitude of a corresponding elevation point on the surface of a virtual terrain model, using said altitude difference to generate an altitude correction signal for said each point in said first set of data points, and applying said altitude correction signal to said altitude of said moving body contained in said each point of said first set of data points; wherein said each point in said first set of data points further comprises oscillation frequency, wherein said oscillation frequency describes the frequency of oscillations caused by vibration movements of the moving body and recorded on said moving body at a given point in said recorded trip; and applying said on-ground algorithm step comprises: eliminating points in said first set of data points wherein said ground speed exceeds a pre-defined ground speed threshold to create a first intermediate set of data points, eliminating points in said first intermediate set of data points wherein the absolute value of said vertical speed exceeds a pre-defined vertical speed threshold to create a second intermediate set of data points, and eliminating points in said second intermediate set of data points wherein said oscillation frequency falls below a pre-defined frequency threshold to create said second set of data points.