A contour line (also level set, isopleth, isoline, isogram or isarithm) of a function of two variables is a curve along which the function has a constant value. In cartography, a ...

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Level (Contour) Plots Description. This function produces a contour plot with the areas between the contours filled in solid color (Cleveland calls this a level plot).

Level (Contour) Plots Description. This function produces a contour plot with the areas between the contours filled in solid color (Cleveland calls this a level plot).

Lower elevations, between the 10 ft contour and sea level surround this ridge. With practice we can picture topography by looking at the map even without the cross ...