Module 6: Isarithmic Mapping

 What are Isarithmic maps? 

An Isarithmic map showcases continuous surfaces using isolines. An example of this is presenting precipitation levels. Contours are used in logarithmic maps to connect the location of equal values. 

Lab Description

In the lab, we designed an Isartihmic map of Average Annual Precipitation in the State of Washington over 30 years. We obtained the raster data through the USDA Geospatial Gateway. The data was published by the U.S Department of Agriculture, Natural Resources Conservation Service, and National GEospatial Management Center from September 2012. The data originated from the PRISM Group at Oregon State University. 

How was the precipitation data derived and interpolated? 

The precipitation data was derived and interpolated by PRISM (Parameter-elevation Relationships on Independent Slopes Model) that accounts for physiographic factors influencing climate patterns. DEM (Digital Elevation Model) is calculated in the data between the climate values and elevation values to be assigned values similar to the value the grid cell represents. Some factors that are considered in reassigning values to grid cells that I believed are associated with the lab are location, elevation values, or proximity. 


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