These types of maps are a two diminutional representation of a three-dimensional model. It contains continuous lines joining the points of the same value. Examples would be equal altitude, temperature, barometric pressure, wind speed, wind direction, and wind shear. These examples more specifically use contour lines, isotherms, isobars, isotachs, isogons, and isoshears, respectively. They are used to interpret the information on some thematic maps. This map has isolines (more specifically isobars) indicating changes in the pressure. It shows low pressure in the Middle of the states, and higher pressure on both the east and west.
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