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The second NOAA/NASA Join Polar Satellite System (JPSS-2) satellite was successfully launched on November 10, 2022, becoming NOAA-21. Instruments on-board the NOAA-21 satellite include the Visible Infrared Imaging Radiometer Suite (VIIRS). This instrument is the third build of VIIRS, with the first and second flight instruments onboard NASA/NOAA Suomi National Polar-orbiting Partnership (SNPP) and NOAA-20 satellites operating since October 2011 and November 2017, respectively. The purpose of these VIIRS instruments is to continue the long-term measurements of biogeophysical variables for multiple applications including weather forecasting, rapid response, and climate research. The geometric performance of VIIRS is essential to retrieving accurate biogeophysical variables. This paper describes the early on-orbit geometric performance of the JPSS-2/NOAA-21 VIIRS. It first discusses the on-orbit position and attitude performance, a key input needed for accurate geolocation. It then discusses the on-orbit geometric characterization and calibration of VIIRS and an initial assessment of the geometric accuracy. It follows with a discussion of correcting the scan angle dependent geolocation biases across the scan. Finally, this paper discusses onorbit measurements of the band-to-band co-registration, focal length and the impact of this on the scan-to-scan underlap/overlap.
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