Contour lines program reads data (points list and break lines) from the external files, or from the current contents of the Field Data Editor and builds contour lines. Then the picture may be edited by entering new break lines, deleting break lines, deleting points, changing the curvuture of the contour lines, entering parallel (offset) break lines, adding new points.
Graphical editor allows zooming and unzooming, panning, switching off and on of contour lines, triangulation, points names and elevations, sending picture to the AutoCad, making 3-D view.
The second function of the program is earth work features as calculation of volumes between two surfaces, longitudinal and cross sections, calculation of volumes by cross sections etc.
This is how an earth work diagram looks like