Contour Lines

A contour about to cross a stream runs up one side and down the other, making a V where it crosses, the angle of the V pointing up stream. Contour lines representing spurs between stream lines are generally U shaped with the bottom or rounded part of the U pointing down hill.

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Contour lines representing a topographic surface.

Mountain Navigation - Contour Lines

2: Dune: d) contour lines at 1:200 scale; e) contour lines at 1