contour line(redirected from Isogon (geomagnetism))
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A line on a map that joins points of equal elevation.
(Physical Geography) a line on a map or chart joining points of equal height or depth. Often shortened to: contour
a line representing the locus of points at the same elevation on a topographic surface.
A line on a map joining points of the same elevation.
A line on a map or chart connecting points of equal elevation.
A line on a map that connects points of equal height.