Method and a device for assisting low altitude piloting of an aircraft

A method of assisting low altitude piloting of an aircraft, the method comprising the steps of determining at least one guard curve referred to as a “main” guard curve as a function of predetermined pull-up and pitch-down maneuvering capabilities of the aircraft, determining all of the obstacles present in at least one search zone, performing a comparison between a top of each obstacle in a search zone and the main guard curve, determining a “most dangerous” obstacle as a function of the comparison, and communicating information to a pilot about the most dangerous obstacle, wherein in order to perform the comparison, if at least one obstacle is a “potentially dangerous” obstacle having a top situated above the main guard curve in a search zone, then for each potentially dangerous obstacle the method comprises determining a sight angle (α) for the top of the potentially dangerous obstacle, and the most dangerous obstacle is the potentially dangerous obstacle presenting the greatest sight angle (α).