Method for locating difficult access points on a map

摘要

The locating of difficult access points, on a topological map of the zone overflown by an aircraft, plotted on the basis of a map of curvilinear distances taking account of the vertical flight profile of the aircraft, is effected by analyzing the map of curvilinear distances, by means of a chamfer mask cataloging the approximate values C(V) of the Euclidean distances separating a point C₀₀ of the map from its nearest neighbors V, so as to extract therefrom, at each point C₀₀ of the map of curvilinear distances, the discrepancies 1DT(V)-DT( 0 ) 1 of curvilinear distances separating the point considered C₀₀ from its nearest neighbors V, compare these discrepancies 1DT(V)-DT( 0 ) 1 with the approximate values C(V) of the Euclidean distances of the chamfer mask and describe the point considered as difficult of access when a difference is noted between Euclidean distance and discrepancy of curvilinear distances. This locating proves to be useful for signaling the reliefs that are not accessible by a shortest path but are accessible after detour.