The National Park Service did a study to evaluate(~6.8 megs) the effectiveness of 2D hiking maps compared to 3D hiking maps for communicating trail information. One finding was that in general, 3D maps enabled hikers to more accurately identify their position on the landscape compared to 2D maps. We've produced a both 2D & 3D maps for Larimer County's Natural Resource Recreation map, but the Horsetooth Mountain Park is one of my favorites.
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