Earth Observing 3 (EO3) was a proposed joint mission between NASA New Millennium Program and the US Navy's Office of Naval Research.

Geosynchronous Imaging Fourier Transform Spectrometer — Indian Ocean METOC Imager (GIFTS-IOMI) was the instrument selected by NASA to perform as EO3's latest weather satellite observing instrument.

The EO3 project ended with the cancellation of NMP in 2008.

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