Free Topo Maps - MyTopo/Maptech MapServer - 1 views
-
Matthew Leingang on 21 Feb 12It's centered on Somerville, MA, but you can enter latitude and longitude or a ZIP code to focus on any point in the US. The curved lines represent points with the same elevation. Lines close together mean a steep slope (either upward or downward depending on the actual elevations). Concentric curves mean a peak or valley. What indicates a saddle point?