![]() Take a bowl and turn it upside down on a table. The spacing of contour lines on a map tells you how "steep" the slope is. ![]() If a point on a map is between the 20' and the 30' contours all you know is that the point is greater than 20' above sea level and less than 30' above sea level you can not "guess" the exact elevation. If the contour interval is 10', then the next highest contour line is the 30' line and the next lowest is the 10' line. For example, the 20' contour line connects all points on the map that are exactly 20' above sea level.įor each map a contour interval is selected this is the vertical distance between adjacent contour lines. A contour line on a map connects points that are at the same distance above, or below, sea level (or some other reference surface). You should review a brief power point presentation aboutĪ Topographic map shows the variations in elevation of the area represented on the map with contour lines. Read through Appendix C in your text for additional background.
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