Paul A. McGovern - Dunellen NJ Mauro Zambuto - New York NY
International Classification:
G01C 504
US Classification:
356 3
Abstract:
A survey of an airport runway or other large structure includes statistical correction of error caused by atmospheric turbulence. Visible grid markers are placed, e. g. , at twenty foot centers, in rows and columns on the runway. Absolute vertical reference points are established, favorably by using floats in tubes joined to a common trough pipe, for each row of the grid markers. A holographic reference grid is reconstructed, preferably at a safe distance from the runway, so that the reconstructed reference grid is disposed in the vertical plane of a particular row of grid markers. Then the locations of the grid markers, the absolute reference points, and the reference grid are recorded a plurality of times, for example, by multiple-exposing photographic film. The statistical mean locations of the images of the grid markers and absolute reference points are determined, relative to the reconstructed reference grid.