GIS5007 - Module 6 - Isarithmic mapping

 Our objective in this lab was to map Washington State's annual precipitation data using continuous tone symbology and hypsometric tinting with contours to illustrate the elevation. The data was derived from PRISM. PRISM starts with a large set of climate observations from thousands of monitoring stations. For precipitation, these are daily, monthly, or annual measurements from rain gauges. Precipitation patterns are highly influenced by elevation. PRISM incorporates a high-resolution digital elevation model (DEM) to guide its interpolation, modeling how precipitation increases or decreases with elevation based on local terrain. PRISM accounts for slope and aspect, coastal proximity, rain shadows, and temperature/humidity gradients. For time-series data, PRISM interpolates and smooths over time as well, ensuring consistency from month to month or year to year. It often uses a long-term climate normal (1981–2010) to help constrain short-term estimates.We used the Int tool to develop a hypsometric tint into the map to help emphasize the contour lines. We then used the contour list tool to make contour lines to help illustrate elevation. 



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