CONTOURING

# CONTOURING - CONTOURING TUTORIAL What is contouring and...

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CONTOURING TUTORIAL What is contouring, and what is it used for? Contouring is a useful way of showing areas of equal and unequal values on a map. Areas of equal value are indicated with a contour line. Any quantities that can be given numerical values and plotted at fixed positions on a map can be contoured (elevation, grain size, mineral percent, etc.). An example, and basic rules From Example 1, a few generalizations can be made: 1. Every point on a contour line is of the same value; that is the contour lines connect points of equal value. 2. Contour lines always separate points of higher value from points of lower value. You must determine which direction on the map is higher and which is lower, relative to the contour line in question, by checking adjacent values. 3. Contour lines are always the same numeric interval apart. (The difference between any two adjacent contour lines is the contour interval .) 4. Contour lines tend to be smoothly curved (no angular turns). 5.

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CONTOURING - CONTOURING TUTORIAL What is contouring and...

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