The primary objective of the ITOS program was to combine the capabilities of ESSA's operational satellites (the operational meteorological and APT satellites) and the knowledge gained from the ongoing NIMBUS program into one operational program with APT capability. The ITOS program would serve as the second generation of US operational weather satellites, eventually becoming the series of what we now know as the 'NOAA' satellites.
ITOS 1 NOAA 1 ITOS B NOAA 2 ITOS E NOAA 3 NOAA 4 NOAA 5