"Landsat 4, 5 and 8" . . "Return Beam Vidicon" . "Landsat 1 and 2" . . . "NASA Landsat" . . . . . . . "Landsat program" . . "U.S. Landsat" . "Earth Resources Satellite" . "Landsat" . "EROS Data Center" . . "Landsat satellite data" . . "Landsat satellite" . "LANDSAT" . "land sat imagery" . "Landsat Data Continuity Mission (LDCM)" . . "Landsat 7" . "Landsat satellites" . "Landsat satellite imagery" . . "Landsat program" . . . "Landsat Program" .