Raster Based GIS Conference

How to Find the Best Stargazing Spots in the United States Using GIS

The purpose of this project was to find the most optimal stargazing spots that are within a 300-mile radius of Fort Collins, Colorado. This topic was inspired by a road trip I went on 4 years ago with my best friend, as we are both astronomy enthusiasts and were searching for the darkest areas to view the most stars at night. I thought instead of choosing where we go based on random internet articles, why not use GIS to solve where we should go? After finding a raster tile from NOAA of the night sky over the US, parameters were made to help further chose the right locations. Ideally, the location was 300 miles from Fort Collins, within a National Forest so there is free camping, has a slope of less than 2 degrees, and an aspect between 120 and 240 degrees. The night sky, elevation, and aspect rasters as well as the National Forest boundary layer were all projected, then clipped to the 300-mile buffer from Fort Collins. The rasters were then reclassified to their optimal values. Then, a weighted overlay was done making the darkness of the night sky the most heavy-weighted class, followed by slope, and then aspect. This weighted overlay was clipped to the National Forest boundaries that are within 300 miles of Fort Collins, and then the area of each class was calculated within each boundary to determine which National Forests had the most optimal areas for stargazing. The results show that Santa Fe, Manti-La Sal, and Grand Mesa National Forests have the most percent area of optimal stargazing locations. In the future, I would like to create a function in ModelBuilder to automate this entire process.

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