contour line(redirected from Halleyan lines)
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a line on a map or chart joining points of equal height or depth
contour line[′kän‚tu̇r ‚līn]
A map line representing a contour, that is, connecting points of equal elevation above or below a datum plane, usually mean sea level. Also known as contour; isoheight; isohypse.
A line on a weather map connecting points of equal atmospheric pressure, temperature, or such.
A line on a map or drawing representing points of equal elevation on the ground.