Abstract
One of the key instruments on NPP is the Visible/Infrared Imager Radiometer Suite (VIIRS), which succeeds the NOAA AVHRR and EOS MODIS. With 22 spectral bands covering wavelengths from 0.41 to 12.5mm, VIIRS provides data for the production of 22 Environmental Data Records (EDRs) with its calibrated and geolocated Sensor Data Record (SDRs). This paper provides an overview of the VIIRS postlaunch calibration and instrument performance status, focusing on the overall calibration/validation strategies both onboard and vicarious, and the team effort on ensuring the high quality of VIIRS SDR, as well as the challenges and way forward. Since launch, the VIIRS SDR postlaunch cal/val has been progressing well. Following a series of spacecraft and sensor activation and checkouts, the first VIIRS image was acquired on November 21, 2011. Shortly after the opening of sensor cryo-cooler door, all 22 bands have been collecting useful Earth view data since January 20, 2012. Major challenges encountered thus far include the unexpected fast optical throughput degradation in some NIR channels, and the unprecedented data volume and complexity of the ground processing system. Our goal is to ensure the radiometric, spectral, and geospatial accuracy, and establish consistency with past and future sensors to support the weather, climate, ocean, and other environmental applications.
Suomi NPP VIIRS SDR Postlaunch Cal/Val - Overview of Progress and Challenges
One of the key instruments on NPP is the Visible/Infrared Imager Radiometer Suite (VIIRS), which succeeds the NOAA AVHRR and EOS MODIS. With 22 spectral bands covering wavelengths from 0.41 to 12.5mm, VIIRS provides data for the production of 22 Environmental Data Records (EDRs) with its calibrated and geolocated Sensor Data Record (SDRs). This paper provides an overview of the VIIRS postlaunch calibration and instrument performance status, focusing on the overall calibration/validation strategies both onboard and vicarious, and the team effort on ensuring the high quality of VIIRS SDR, as well as the challenges and way forward. Since launch, the VIIRS SDR postlaunch cal/val has been progressing well. Following a series of spacecraft and sensor activation and checkouts, the first VIIRS image was acquired on November 21, 2011. Shortly after the opening of sensor cryo-cooler door, all 22 bands have been collecting useful Earth view data since January 20, 2012. Major challenges encountered thus far include the unexpected fast optical throughput degradation in some NIR channels, and the unprecedented data volume and complexity of the ground processing system. Our goal is to ensure the radiometric, spectral, and geospatial accuracy, and establish consistency with past and future sensors to support the weather, climate, ocean, and other environmental applications.