Translation guide
A line on a map connecting points of equal elevation. In Japanese, the standard term is 等高線, but related expressions exist for specific contexts.
A line on a topographic map showing elevation
The standard technical term for contour lines on maps. Used in geography, hiking, and cartography.
この地図の等高線は10メートル間隔です。
The contour lines on this map are at 10-meter intervals.
A thicker contour line, usually every fifth line, labeled with elevation
Specifically refers to index contours, the thicker lines with elevation numbers. Used in map reading.
計曲線には標高が書いてあります。
The index contours have the elevation written on them.
A thinner contour line between index contours
Refers to intermediate contour lines, the thinner lines between index contours. Technical term.
主曲線は細い線で描かれています。
Intermediate contours are drawn with thin lines.
A dashed contour line showing half-interval elevation change in flat areas
Supplementary contours, often dashed, used in flat terrain to show subtle elevation changes. Technical cartography term.
平らな場所では補助曲線が使われることがあります。
In flat areas, supplementary contours are sometimes used.