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Topographic Maps. I. Topographic Maps. A. Topographic maps show the shape and elevation of the land. B. They also show man-made features such as roads, development, trails, etc. II. Contour Lines. A. Topographic maps use Contour Lines to show elevation and land shape .

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## Topographic Maps

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**I. Topographic Maps**A. Topographic maps show the shape andelevation of the land. B. They also show man-made features such as roads, development, trails, etc.**II. Contour Lines**A. Topographic maps use Contour Lines to show elevation and land shape. B. A Contour Line is a line on a map that connects places of equal elevation.**C. The Contour Interval is the difference in elevation**between two consecutive contour lines D. Index Contour- a contour line that is numbered with the elevation. Contour Interval Contour Interval**0**0 - -**1st: Calculate the difference between the 2 index contours.**2nd:Count the number of contour lines between the 2 index contour lines and add 1. (This is how many “Steps” the elevation has changed) 3rd: Divide the difference calculated in #1 by the number of “steps” figured in #2 and you will get the value of the contour interval. What is the contour Interval?**III. How Topographic Maps are made**A. The land is surveyed to find the elevation of the land. B. A contour interval is chosen based on how steep the land is. C. Lines are drawn connecting places with equal elevation.**IV. Interpreting land shape**A. Contour lines that are spaced close together show STEEP land. Elevation is increasing over a short distance. B. Contour lines that are spaced far apart show land that is NOTsteep (a gentle slope). Elevation isn’t changing much in a given distance.**VI. Mountains and depressions**A. Contour lines form closed circles around mountain peaks. B. An area of depression is indicated with hash marks pointing in on the circle. This indicates that elevation goes down.**VII. Rivers**A. Because rivers erode land, the area beside a river has a lower elevation than the land around it. This appears as dips in the contour lines. The point of the dip always points UPSTREAM, or up hill.

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