INSPIRE
Registry

form line

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Label:
form line
Definition:
Break line representing a local direction in which the elevation surface being described takes the greatest slope.
Description:
NOTE 1 Form lines are always perpendicular to contour lines describing the same elevation surface.
NOTE 2 This special case of break line is often used to describe troughs and ridges of the terrain surface.
EXAMPLE Ridge line, thalweg.
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