Characterization of the East—West Spatial Uniformity for GOES-16/17 ABI Bands Using the Moon

The Advanced Baseline Imager (ABI) is the primary instrument onboard NOAA Geostationary Operational Environmental Satellite-R Series (GOES-R) satellites, providing continuous weather imagery over vast area in Western Hemisphere. It imperative to ensure consistent calibration accuracy within instrument’s field of regard (FOR). This paper characterized spatial uniformity east–west (EW) direction for six ABI visible and near-infrared (VNIR) bands first two GOES-R GOES-16 (G16) GOES-17 (G17), using a special collection lunar chasing images during their post-launch testing product (PLT/PLPT) periods. EW response versus scan-angle (RVS) examined with normalized irradiance ratios at varying scan angles combined from multiple lunar-chasing events. impacts straylight Earth were found some B01–B03 images. straylight, including those scattered into spacelook scenes near polar regions leaked space Moon, can cause RVS variation up 1% B01 lesser magnitude other bands. Straylight correction algorithms are applied accurate image calculation. After corrections, reduced less than 0.3% all VNIR both G16/17 full-disk (FD) Results this study also confirm that Global Space-based Inter-Calibration System (GSICS) Implementation ROLO (GIRO) model has high relative when collected relatively short time. method described be validate imagers on geostationary recently launched GOES-18 future GOES-U satellites.