ECCOE Landsat quarterly Calibration and Validation report—Quarter 1, 2023

First posted July 20, 2023 For additional information, contact: Director, Earth Resources Observation and Science CenterU.S. Geological Survey47914 252nd StreetSioux Falls, SD 57198Contact Pubs Warehouse The U.S. Survey Calibration Validation (Cal/Val) Center of Excellence (ECCOE) focuses on improving the accuracy, precision, calibration, product quality remote-sensing data, leveraging years multiscale optical system geometric radiometric calibration characterization experience. ECCOE Landsat Cal/Val Team continually monitors performance active missions makes adjustments, as needed, to maintain data at highest level.This report provides observed analysis results for Landsats 7–8 quarter 1 (January–March) 2023. All used compile presented in this are freely available from EarthExplorer website: https://earthexplorer.usgs.gov.One specific activity that closely monitored was a 8 safehold anomaly. On January 26, 2023, Global Positioning System (GPS) onboard became invalid because GPS fault tripped. Later same day, reinitialized, but Field View trip occurred early next morning, causing observatory go into Point Safe mode, which put Operational Land Imager (OLI) Thermal Infrared Sensor (TIRS) safehold. Once it safe reactivate sensors, OLI transitioned operational status late 27 TIRS reactivated 28. Additional information about anomaly is here: https://www.usgs.gov/landsat-missions/news/landsat-8-recovers-safehold.