Allows one to define the vertices of the alignments graphically by marking them as if they were the representation of a polyline within or outside the orthogonal projection of the longitudinal profile’s terrain. The definition is completed by pressing <Enter> twice, so that the program associates the graphic created on the terrain.
Only the areas between the origin and the end of the profile will be drawn. Intersections are calculated and the horizontal alignment outside the area is eliminated, automatically modifying the alignments to leave only the resulting alignment. One can then proceed to export the grade line to a file, so that it can subsequently be used in other processes.