This week, we discussed isarithmic mapping techniques, to include continuous tone symbology and hypsometric tinting. We produced two different maps containing precipitation data from the U.S. Department of Agriculture, Natural Resources Conservation Service, National Geospatial Management Center for the period of 1981-2010. The information for the following maps was generated using the Parameter-Elevation Regression on Independent Slopes Model (PRISM). This analytical tool uses point measurements of various climatic factors, to generate gridded estimates of monthly or annual climate characteristics. Specifically, PRISM uses the Digital Elevation Model (DEM) and regression techniques to distribute point values to a grid.
We were tasked with producing a map with continuous tone symbology and the hypsometric symbology. Without utilizing both techniques, I would not have fully understood why hypsometric symbology was best suited for this data set. The hypsometric symbology (using classified data and contours) was the best way to represent the precipitation data because it provided more detail and accuracy, than the first map (continuous tone symbology).
Map using Continuous Tone Symbology:
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