Isoline
An isoline (also contour line or isarithm) of a function of two variables is a curve along which the function has a constant value.
See also
- Isohypse (better known as elevation contours, these show lines of equal elevation, and are often shown on topographic maps)
- Contours - details method of creating contour lines for OpenCycleMap
- Isochrone - curve of equal travel time
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