thickness line

thickness line

[′thik·nəs ‚līn]
(meteorology)
A line drawn through all geographic points at which the thickness of a given atmospheric layer is the same. Also known as relative contour; relative isohypse.
References in periodicals archive ?
A longtime rule of thumb of forecasters is that the 540 decameter thickness line marks the zone dividing rain to the south and snow and winter weather to the north.
The most significant difference is the position of the zero thickness line (the erosional limit) of the group.
3) that we show is different from the zero thickness line on both previous maps.