Classic 7.5 minute USGS topographic map for Manitou Springs, Colorado, 1961. Credit: U.S. Geological Survey. We recently covered the basics of topographic maps, including how to read contour lines, and…
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While we’ve covered how to read a topo map and U.S. Geological Survey (USGS) topographic maps in particular, OpenStreetMap-based topos are increasingly popular resources that merit their own post. In this…