This Flash animation allows students to create and edit contours. The ï¿½Drawï¿½ mode allows the user to point and click on the map placing control points that are connected by a contour line automatically. The delete or backspace removes control points. Clicking on the ï¿½Editï¿½ mode button will place the correct configuration of individual contours at 10 foot intervals from a range of 610 ft. to 690 ft. At any one time, a student can only see the correct contour configuration for one interval. Note that the 630 and 640 closed contours located in northwest corner of the map should be marked as depressions and therefore hachured lines, although there is no indication that this is the case. This is a fairly challenging exercise for a beginning student but mastery of this exercise would indicate a good working knowledge of contour line properties.
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