An isopach map is a map that illustrates the variation in thickness over an area, so isopach lines represent areas with equal heights. Knowing this height can become useful in multiple fields including meteorology, volcanology, and sedimentology to name a few. The map above is a map of geopotential heights, and represents the estimated height at which a given pressure should be found based off of surface measurements. For example, if you were to follow a constant geopotential height you would change in actual altitude because the pressure changes continually as you move along the surface of the earth. In the map above there are overall low geopotential heights in the Northwest U.S. high geopotential heights in the Southeast U.S.
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