Description
The Climate Absolute Radiance and Refractivity Observatory (CLARREO) Pathfinder (CPF) Level-1A and 1B data comprise high-accuracy, spectrally-resolved Earth-reflected solar radiation measurements obtained by the HyperSpectral Imager for Climate Science (HySICS) aboard the International Space Station (ISS). HySICS is a push-broom spectrometer with a spectral range of 350-2300 nm and a spectral sampling of 3nm. It captures a nadir swath of 70 km with a spatial resolution of 0.5 km. The Level-1 data include spectrally-resolved top-of-atmosphere radiances and reflectances (in separate files),along with measurement uncertainties, solar and viewing geometry information, geolocation, and quality assurance parameters associated with each pixel-level measurement. HySICS uses the Sun as the primary source for in-orbit calibration, achieving an impressive SI-traceable radiometric uncertainty of 0.3-0.6% (k=1). The Laboratory for Atmospheric and Space Physics(LASP) at the University of Colorado will provide the CPF Level-1 data. Due to its superior radiometric accuracy, the CPF Level-1A data will be utilized to demonstrate a state-of-the-art intercalibration methodology using CERES and VIIRS as target intercalibration instruments. The CPF Science and Data Management teams at NASA Langley Research Center will produce the CPF Level-4 intercalibration data products by merging the CPF Level-1A data with CERES SSF and VIIRS Level-1B and Level-2 data over intercalibration footprints.