USGS <a href="https://en.wikipedia.org/wiki/orthophoto" class="extiw" title="w:orthophoto">orthophoto</a> of <a href="https://en.wikipedia.org/wiki/Nellis_Air_Force_Base" class="extiw" title="w:Nellis Air Force Base">Nellis Air Force Base</a> in Las Vegas, Nevada, United States.
<a href="//commons.wikimedia.org/w/index.php?title=United_States_Geological_Survey&amp;action=edit&amp;redlink=1" class="new" title="United States Geological Survey (page does not exist)">United States Geological Survey</a> (USGS)
USGS <i>The National Map</i> via <a rel="nofollow" class="external text" href="http://msrmaps.com/">MSR Maps</a> (formerly TerraServer-USA)