Initial pictures secured by RCA return beam vidicon cameras were transmitted by Nasa's Earth Resources Technology Satellit (ERTS) less than 2 days after its launch into polar orbit, July 23. Informations wanted by such satellites are for purposes of agriculture, forestry, geology, geography, hydrology, oceanography and ecology.
Nasa's ERTS1 returns initial photographs from polar orbit
Nasa's ERT-Satellit schickt erste Bilder von der Polar-Umlaufbahn
Aviation week a. space technol. ; 97 , 5 ; 50
1972
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Probabilistic Initial Orbit Determination Using Radar Returns (AAS 13-704)
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