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Poised for launch in mid-2021, the joint NASA-USGS Landsat 9 mission will
continue this important data record. In many respects Landsat 9 is a clone
of Landsat-8. The Operational Land Imager-2 (OLI-2) is largely identical
to Landsat 8 OLI, providing calibrated imagery covering the solar
reflected wavelengths. The Thermal Infrared Sensor-2 (TIRS-2) improves
upon Landsat 8 TIRS, addressing known issues including stray light
incursion and a malfunction of the instrument scene select mirror. In
addition, Landsat 9 adds redundancy to TIRS-2, thus upgrading the
instrument to a 5-year design life commensurate with other elements of the
mission. Initial performance testing of OLI-2 and TIRS-2 indicate that the
instruments are of excellent quality and expected to match or improve on
Landsat 8 data quality.