1871	 Automatic Contour Map	 Some methods for contour mapping by means of a digital plotter are discussed and a new method is presented that is simple enough to be implemented by programs with a rather small number of instructions about FORTRAN IV instructions are required . Comparisons with some methods proposed by other authors are also performed A FORTRAN IV program implementing the proposed method is available at the Istituto di Elettrotecnica ed Elettronica Politencnico di Milano. contour map level lines digital plotting function scanning
