Lot 12 in the East Tennessee Progress Center, in Morristown, was chosen as one of the 70 sites in total. ... There must also already be a boundary survey completed, as well as topographic maps.

Maps were produced by USGS at that scale as early as 1904, with revisions made until 2006. 3DHP uses updated, high-accuracy elevation data collected as part of the 3D Elevation Program .