Abstract: A system including a module for acquiring source bases of terrain data corresponding to an area of a terrain, divided into a plurality of cells; each source base containing, for each cell, an elevation, a module for transposing each source base into a respective transposed base of terrain data corresponding to the area of terrain, divided according to a reference mesh into a plurality of transposed cells, each transposed base including, for each transposed cell, a transposed elevation, a module for evaluating a local consistency level, based on the comparison of the transposed elevation of the cell with the transposed elevation of the corresponding transposed cell of at least one other transposed base, and an assistance module configured to determine a navigation assistance datum for the aircraft, depending on the assessed local consistency level.

Abstract: The invention relates to a method of alert calculation for an aircraft obstruction proximity warning system including a step for detecting a hazardous flight situation capable of triggering an alert as a function of a data signal representing the change in height below the aircraft, including, prior to the step of detection, a step for converting the data signal representing the change in height as a function of information representative of the vertical profile of the obstructions below the aircraft.

Abstract: The invention is an automatic method making it possible to determine the characteristic points of a bridge as well as their correct ordering on the basis of an airport database, with a view to allowing the correct graphical representation of the said bridge on a digitized airport map. One of the main advantages of the invention resides in its automatic character.

Abstract: The invention relates to a method of alert calculation for an aircraft obstruction proximity warning system including a step for detecting a hazardous flight situation capable of triggering an alert as a function of a data signal representing the change in height below the aircraft, including, prior to the step of detection, a step for converting the data signal representing the change in height as a function of information representative of the vertical profile of the obstructions below the aircraft.

Abstract: The invention is an automatic method making it possible to determine the characteristic points of a bridge as well as their correct ordering on the basis of an airport database, with a view to allowing the correct graphical representation of the said bridge on a digitized airport map. One of the main advantages of the invention resides in its automatic character.