So the map for this post comes from Lesson 4 in the Bolstad book. In order to make this map, I had to georeference four different aerial images; three were from 1938, and one was from 2008. From these georeferenced images, I was able to create two shapefiles that show the shoreline of Big Marine Lake in Washington County, Minnesota. The comparison of the two resulting shapefiles shows the increase in the lake's area in the decades since the Dust Bowl. Enjoy!
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