The invention discloses a method for extracting characteristic points and characteristic lines of a trough
ridge by using contour data, and a weather chart
analysis method. The present invention provides a method for extracting groove
ridge feature points from contour
field data. For the non-closed contour, three points are chosen according to the included angles of every three points on the contour, and the selected points are formed into a sequence S, and the characteristic points of the groove
ridge are determined according to the arc characteristics of S. The invention provides a method for extracting groove ridge characteristic lines by using
contour line data. On the basis of extracting groove ridge characteristic points, the groove / ridge point properties are identified in three schemes, the groove / ridge points are clustered according to distance conditions, and finally, all groove / ridge points of a congruence cluster are simulated by using a Bessel curve to obtain groove / ridge lines. The invention provides an application of two methods in the analysis of weather maps and topographic maps, and a
weather map analysis method. The method of the invention can simultaneously identify the groove point and the ridge point, generate the groove line and the ridge line, has high
algorithm efficiency and accurate result, and the obtained groove ridge line has no crossing and beautiful appearance.