Topo Maps From Google Earth

I mainly use National Geographic TOPO! or one of the online services such as MyTopo for Topographic maps.  However, recently I  download a free add-on  for Google Earth, called the Topographical Overlay, that adda a KMZ “layer” of official US topo maps on Google Earth.  When toggled on, the Topo Overlay displays standard USGS 7.5 minute topos as a seamless map so you can center your interest in the middle of a custom map.


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