The EARS-VIIRS service collects data from the VIIRS instrument onboard the SUOMI-NPP spacecraft, operated by NASA and NOAA.
The Visible Infrared Imaging Radiometer Suite (VIIRS) is a scanning radiometer, which collects visible and infrared imagery and radiometric measurements of the land, atmosphere, cryosphere, and oceans. VIIRS data is used to measure cloud and aerosol properties, ocean colour, sea and land surface temperature, ice motion and temperature, fires, and the Earth's albedo.
Climatologists use VIIRS data to improve our understanding of global climate change. The NASA NPP webpages have more details.
The provision of VIIRS data in the form of an EARS service is a logical extension of the EARS-AVHRR service, providing operational imager data with high timeliness for nowcasting applications.
EARS-VIIRS Service Specification
Suomi-NPP, as shown on the tables on the Regional Data Service/EARS webpage.
RT-STPS as provided by NASA and CSPP as provided by CIMSS, configured and run by EUMETSAT. CVIIRS as provided by EUMETSAT for compaction of data.
Segments each containing one granule of observations (~85.6s).
Duplicate segments removed before dissemination.
Products via EUMETCast Europe
Currently two products*:
- All 16 VIIRS M-Band channels.
- The VIIRS Day/Night Band covering dusk, dawn and night time scenes, but excluding day time scenes.
Compact VIIRS SDR (Sensor Data Record) HDF5 product format containing calibrated radiances and geolocation information on tie-point grid. Geolocation to reference ellipsoid and not to terrain model. No observation thinning, lossless compression. Compact VIIRS SDR Product Format User Guide (PDF, 3 MB)
The CVIIRS tool is made available by EUMETSAT to enable users to reconstruct the original NOAA VIIRS SDR product format from the Compact VIIRS SDR.
Latest version of the tool
*Dissemination of S-NPP EARS-VIIRS data compacted with CVIIRS 2 will begin on 2 May 2018. By this time, users will need to have migrated to CVIIRS 2 in order to be able to expand all EARS-VIIRS products.
Previous versions of the tool
Timeliness via EUMETCast
30 minutes, target 15 minutes.
Products via RMDCN/GTS
Archived in EUMETSAT
For more information on EARS-VIIRS see TD 14 - EUMETSAT Advanced Retransmission Service Technical Description (PDF,2 MB)
Full details on products can be found in the Product Navigator:
VIIRS Regional Data Service – Suomi-NPP