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A thin line joining points of equal height.
Also known as: Tokosen mark, Height contour
Denotes a line of constant elevation on a Japanese topographic map, drawn at ten metre intervals on the 1:25,000 series.
Marks a line of constant elevation on a GSI topographic sheet.
Contexts: Maps
Is drawn at a ten metre interval on the 1:25,000 series, with every fifth line thickened so that height can be counted without reading a figure.
Contexts: Maps
A thin continuous curved line following the ground at one height, thickened at every fifth line of the series.