Isopleth maps are maps that use contour lines to connect areas of equal elevation. There is usually a scale that shows the distance between two of the contour lines equal to so many feet. This makes it easy to also look at the steepness of slopes on a topographic map. Because the closer the isopleths are, the steeper the slope.
These are examples of isopleths maps with an interval of 10. This means that the distance between each line on this map is ten feet.
isopleths
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