The Global S-NPP Service is based on the ATMS, CrIS and VIIRS data acquired, processed and formatted by the NOAA/NPOESS Data Exploitation (NDE) project.
The data has a timeliness value typical for global data and the geographical coverage of the datasets is also global. The data is distributed via EUMETCast to European users and via the GTS.
Global NPP/JPSS-1S-NPP data is provided as Sensor Data Records (SDR) (L1) and Environmental Data Record (EDRs) (L2).
The Advanced Technology Microwave Sounder (ATMS) is a new Microwave Sounder combining the capabilities of AMSU-A and MHS in a single instrument.
The Cross-track Infrared Sounder (CrIS) is an IASI-type Infrared Sounder optimised for meteorological sounding of the atmosphere.
The CrIS SDRs are additionally tailored by decoding the BUFR data, retaining only a subset of 399 channels (for GTS dissemination) and re-encoding the data prior to repacking and renaming the file.
Since March 2013, EUMETSAT has been receiving and processing VIIRS EDR data from NOAA NDE, containing cloud top height and combined cloud cover information. This data is received in netCDF and has a different spatial grid and granule resolution than the CrIS data.
As the VIIRS EDRs arrive at EUMETSAT they are decoded and re-gridded. If, at the time of reception of CrIS SDR data processing, collocated VIIRS cloud data are available, these are written into the CrIS SDRs in the foreseen positions in the encoding sequence. If the VIIRS EDRs are not available, the CrIS data are processed as before, and the cloud information remains missing.
NDE generates polar winds from VIIRS for the Arctic and Antarctic from 65 degrees latitude pole ward. Tropospheric winds are measured by tracking the motion of cloud features in the overlapping region of three successive orbits. A triplet of images is used to facilitate consistency checking and quality control. Wind EDRs include wind speed, direction, and height at high latitudes.
|Product Group||Timeliness||Accuracy and Coverage||Completeness||Data Access|
|ATMS SDR||15 mins after products are made available by NOAA.||SDR, all 22 ATMS spectral channels, all Fields of View, calibrated and geolocated, BUFR Format.||Segments each containing 32 seconds of observations.||EUMETCast, GTS/RMDCN|
|CrIS SDR||30 mins after products are made available by NOAA.||SDR, all 1305 CrIS spectral channels, all Fields of View, calibrated and geolocated. Co-located cloud information derived from VIIRS data. BUFR Format.||Segments each containing 32 seconds of observations.||EUMETCast, GTS/RMDCN|
|VIIRS EDR||15 mins after products are made available by NOAA.||Geolocated data in BUFR format.||–||EUMETCast, GTS/RMDCN|
Access to the data and products typically involves an initial registration process. For further information, please visit our Data Registration page, or register on the Earth Observation Portal (EOP).