Cartography Week 6: Isarithmic Mapping


 This week I learned about isarithmic maps, a type of thematic map used to depict continuous data such as weather phenomena. This map I created shows the annual precipitation in Washington state between 1981 and 2010. The data on the map was collected and interpolated using PRISM (Parameter-elevation Regressions on Independent Slopes Model), a method that utilizes a digital elevation model (DEM) to accurately report precipitation. The map uses hypsometric tint to display the precipitation data, broken into classes and using contour lines to express elevation.

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