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Topographic Maps

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Rick Turner

on 19 February 2014

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Transcript of Topographic Maps

Topographic Maps A topographic map is a map that shows surface features, or topography, of Earth. Elevation is an object's height above sea level. The elevation at sea level is zero. Contour lines are lines that connect points of equal elevation.
Example: One contour line would connect points on a map that have an elevation of 100 ft. Another line would connect points on a map that have an elevation of 200 ft. The difference in elevation between one contour line an the next is called the contour interval.

Example: A map with a contour interval of 20 ft would have contour lines every 20 ft. of elevation change, such as 0ft, 20 ft, 40 ft, and so on. Relief is the difference between the highest and lowest points of the area being mapped. Contour lines that are close together show a steep slope. Contour lines that are spaced apart show a gentle slope. Index contour lines are darker, heavier contour lines that are usually every fifth line and are marked by elevation. The contour lines falling between the index contour lines are called intermediate contour lines. These lines are finer and do not have their elevations given. There are normally four intermediate contour lines between index contour lines. Supplementary contour lines resemble dashes. They show changes in elevation of at least one-half the contour interval. These lines are normally found where there is very little change in elevation, such as on fairly level terrain.
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