This overlay contains seamless topographic/land cover data for the entire Earth and a USGS Topographic Map overlay for the entire US, including Alaska and Hawaii.
- The 1:250,000 scale USGS Topo Maps are from i-cubed eTOPO.
- The remaining USGS Topographic Maps for the US are are from the National Geographic TOPO! program.
- The global land cover imagery is from the NPS Natural Earth physical map.
Different map scales automatically load as you zoom in with the most detailed maps being available for the US. Hill shading has been added to the maps giving them a 3D appearance.