EARS-VASS (Vertical Atmospheric Sounding Service), complements the Metop and the US POES and SNPP/JPSS satellites currently covered by EARS.

EARS-VASS data example

The IRAS instrument is a classical infrared sounder with similar characteristics to the HIRS instrument flown on the Metop and NOAA satellites.

Its 20 bands provide information on the vertical structure of temperature and water vapour in a cloud-free atmosphere and above clouds.

The advantage of microwave sounders like the MWHS-II instrument is their ability to perform vertical atmosphere sounding in cloudy conditions.

Like the MHS instrument on the Metop and NOAA satellites, it focuses on water vapour sounding of the upper troposphere, but also provides information on temperature profiles. The information on the three-dimensional distribution of temperature and water vapour provided by the combination of these two instruments is one of the most valuable inputs for forecast models of all scales.

EARS-VASS Service Specification


Geographical coverage

EARS VIIRS Geographical Coverage Map Core

Satellites supported

FY-3C and FY-3D, as shown on the tables on the Regional Data Service/EARS webpage.

Product Processing

FY3_IPP as provided by the CMA, configured and run by EUMETSAT AAPP as provided by NWP-SAF.

Product Segmentation

One file per station pass and instrument.

Duplicate segments removed before dissemination.

Products via EUMETCast Europe

Level 1b MWHS-II and IRAS. All spectral channels, all Fields of View. Calibrated and geolocated. BUFR format.

Timeliness via EUMETCast

30 minutes.

Products via RMDCN/GTS

As for EUMETCast.

Archived in EUMETSAT


Further information

For more information on EARS-VASS see TD 14 - EUMETSAT Advanced Retransmission Service Technical Description (PDF,2 MB)

Full details on products can be found in the Product Navigator:
Regional Atmospheric Sounding Service – Feng-Yun - 3C

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