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Why is the orthoimage (air photo) layer not available for some US Topo maps and OnDemand Topo maps?

In the lower 48 States, orthoimages (rectified air photographs) for US Topo maps and OnDemand Topo maps comes from the National Agriculture Imagery Program (NAIP). There are areas over some military installations where NAIP imagery is not available. In these locations, the OnDemand Topo maps will either not include imagery or contain partial imagery. US Topo maps are only produced for areas that have at least partial image coverage. 

 Areas with incomplete imagery include: 

  • Edwards Air Force Base, CA 
  • Nellis Air Force Base, Nevada National Security Site (Area 51), NV 

  • Eglin Air Force Base, FL 

  • Fort Bragg Military Reservation, NC 

  • Aberdeen Proving Ground, MS