CrIS/VIIRS Collated Products and Evaluation

An operational processing system has been developed in NESDIS to collocate and integrate observation and product data from The Visible/Infrared Imager/Radiometer Suite (VIIRS) to the Cross-track Infrared Sounder (CrIS) observation data. The collocated VIIRS observation and product provide the CrIS retrieval processing with extended spectral coverage and sub-pixel spatial resolution information . The collocation algorithm is based upon look-up tables (LUT) that are selected to satisfy the processing speed requirement for operational processing. The LUT is defined by the instrument optical characteristic, sampling pattern and the features of the satellite orbit. The CrIS instrument spatial response function is also applied during the integration processing to obtain the physical consistency between the observations from the two different satellite sensors. A brief review of the integration algorithms, the LUT algorithms and the problems existing for operational processing will be discussed. The product detail, parameter selection and the product evaluation results will be presented in detail.