Real Time Plotting of Approximate Contour Maps None CACM September, 1978 Ward, S. Contour map, digital plotting, graphical characters 3.10 3.20 4.41 8.2 CA780910 DH January 29, 1979 6:33 PM 2287 4 3062 2547 4 3062 3062 4 3062 3062 4 3062 1871 5 3062 1925 5 3062 3062 5 3062 3062 5 3062 3062 5 3062