For this project, I created an isarithmic map to represent average annual precipitation in Washington State (1981–2010)using PRISM climate data. The goal was to apply different cartographic techniques to effectively visualize continuous precipitation data while incorporating topographic context.
The process began by generating a hillshade raster to create a 3D surface effect, enhancing terrain visualization. I then used the INT tool to convert the PRISM raster’s continuous values into integers for classification. Using the Symbology pane, I applied hypsometric tints with a precipitation color ramp to display ten distinct precipitation ranges. Finally, I added contour lines using the Contour List tool to highlight exact precipitation intervals, improving map readability and precision.
This combination of symbology techniques, continuous data classification, hillshade effects, and contour overlays, clearly communicates how Washington’s terrain influences rainfall distribution. The final map demonstrates the importance of using GIS tools and cartographic methods to turn raw spatial data into an informative and visually engaging representation.
To improve visual impact, I chose a black background to make the hypsometric colors and contour lines stand out more clearly. I also included essential map elements such as a legend, scale bar, north arrow, and data source credits to ensure the map was both functional and professionally presented.
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