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Basal Line On A Topographic Map

Topographic Map Symbols U.S. Geological Survey. WebTopographic map symbols. Interpreting the colored lines, areas, and other symbols is the first step in using topographic maps. Features are shown as points, lines, or areas, depending on their size and extent. For example,.

Topographic Map Symbols U.S. Geological Survey
Topographic Map Symbols U.S. Geological Survey from cnx.org

WebMany maps have either a 40- or 80-foot contour interval: An 80-foot interval simply means that each contour line is 80 vertical feet away from the next closest line. You find the contour.

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