Isarithmic Mapping Lab

 Isarithmic Mapping Lab – Visualizing Precipitation Patterns

For this lab, I explored the creation of isarithmic maps using continuous raster data to visualize average annual precipitation across Washington State. The objective was to apply different symbology methods, including continuous tones, hypsometric tinting, and contour overlays, to effectively represent a continuous surface.

I began by working with PRISM-interpolated precipitation data, which incorporates elevation and other physiographic factors to improve spatial accuracy. First, I created a continuous tone map using a stretched precipitation color ramp, blending precipitation values smoothly across the state. Then, I developed a hypsometric tint map by manually classifying the data into ten ranges, applying distinct color bands to highlight differences in precipitation levels. To enhance visual clarity, I overlaid contour lines corresponding to the classified intervals.

Throughout the process, I applied key cartographic design principles, such as visual hierarchy, contrast, figure-ground relationship, and balance, to ensure the final maps were both informative and visually appealing. This lab helped reinforce how different symbolization methods serve different purposes: continuous tones are ideal for depicting gradual changes, while hypsometric tinting is useful for emphasizing distinct data ranges.

Overall, this exercise improved my understanding of isarithmic mapping techniques and highlighted the importance of thoughtful map design when presenting continuous data.