EntityQ7271980· pop 6· linked from 95 articlesQuillSign in to savereconnaissance satellite programConnectionssignals intelligenceEntitysynthetic aperture radarEntityCoronaEntityOrionEntityIndianaEntityMichiganEntityAlmatyEntityNova ScotiaEntityNewfoundland and LabradorEntityWayback MachineEntityUniversity of MichiganEntityEdward Mills PurcellEntitygeostationary orbitEntitylow Earth orbitEntitycathode ray tubeEntitymagnetic tapeEntityperspectiveEntityUnited States Geological SurveyEntityDijkstra's algorithmEntityVandenberg Space Force BaseEntityCategories1964 in spaceflightNational Reconnaissance OfficeReconnaissance satellites of the United StatesSpace synthetic aperture radar