Contour line, Topography, Mapping, Surveying

Contour line, a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level. Imagine a land surface inundated by the sea to a depth of 100 feet (30.5 metres)—that is, the intersection of a horizontal

Contour line, Topography, Mapping, Surveying

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contour lines and how to read topographical maps

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