ZMap Quadratic - Version 2.00.00 If you export your contours in zmap format this program will apply a quadratic equation to the contours. Note that after the formula has been applied the contour interval will likely be 'non-standard' but the program is excellent for converting hand drawn digitized contours and then re-digitize the new depth contours for a final map. The program is also valuable for applying static shifts to the contour values.