Isarithmic Mapping Lab 6

This lab covered isarithmic mapping which depict smooth, continuous phenomena across an area. The phenomena is measured at control points and then interpolated using the most appropriate method. This lab focused on mapping annual precipitation data of Washington state over a 30 year period. 

The data was prepared with PRISM (Parameter-elevation Relationships on Independent Slopes Model) interpolation method. PRISM integrates elevation data using a digital elevation model (DEM) to account for the relationship between precipitation and elevation. For each DEM grid cell, a climate-elevation regression is calculated, with input stations weighted based on physiographic similarity. Key factors include location, elevation, coastal proximity, topographic orientation, vertical atmospheric layer, topographic position, and terrain effectiveness.

Hypsometric tints was used to best represent the dataset. The precipitation color scheme in ArcGIS was chosen to represent the precipitation which was separated into 10 classes. A hill shade effect was also added to the map. Contour lines were then added to the map to give a 3D effect making it easier for the user to interpret the map. 



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