Contour lines are lines that join up areas of ... mapping large and small scale maps since 1745, initially for military purposes. Maps contain a lot of information about the areas of land that ...
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A beginner’s guide on how to read a topographic mapIt was originally developed as a way to depict counties and cities before the U.S. military ... the contour interval, or distance in vertical feet, between contour lines. For any given map ...
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