Three computer programs for contouring map data

Three programs in FORTRAN IV language, to control an IBM 7094 computer and a CALCOMP plotter for contouring map data, are described briefly. In the first program there is no information on strike to bias the contouring. In the second program prior information on strike biases the contouring. In the third program any prior information on strike is recomputed and the result biases the contouring.