Isopleths
Isopleths are used for contour lines that cannot be measured at any one point, but must be calculated from a collection of data points over an area. Each calculated value is the value of the variable at the center of that area. This isopleth is measuring the coastal wind velocity over the columbian river by month and latitude. Positive velocity are the winter and fall seasons while negative velocity is seen in the spring and summer seasons.
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