EARS-MERSI & EARS-MWRI Geographical Coverage map



Providing high resolution cloud data

EARS-MERSI & EARS-MWRI Geographical Coverage map
EARS-MERSI & EARS-MWRI Geographical Coverage map

EARS-MERSI complements the Metop and the US POES and SNPP/JPSS satellites currently covered by EARS.

Last Updated

31 May 2022

Published on

27 April 2020

The EARS Medium Resolution Spectral Imager (MERSI) service collects data from the MERSI-II instrument on board FY-3D. MERSI-II is a 25-channel VIS/IR multispectral radiometer (replacing and merging MERSI-1 on FY-3A/3B and VIRR on FY-3A/3B/3C).

Six of the channels have a 250m resolution and the remaining 19 channels have a resolution of 1km. Scanning technique: Cross-track: 2048 detectors for channels at 1000m resolution, or 8192 detectors for channels at 250m resolution, swath 2900km; Along-track: ten 10km lines every 1.5 secs.

EARS-MERSI service specification

Satellites supported

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.

Product segmentation

Segments each containing one minute of observations. Duplicate segments removed before dissemination.

Products via EUMETCast Europe

Two separate products:

  • One product containing science and calibration data, 1km resolution, in HDF format.
  • One product containing geolocation data, in HDF format.

Timeliness via EUMETCast

30 minutes.

Products via RMDCN/GTS


Archived in EUMETSAT


Further information

For more information on EARS-MERSI see TD 14 - EUMETSAT Advanced Retransmission Service Technical Description

Full details on products can be found in the Product Navigator: MERSI - Feng-Yun - 3 - Regional Data Service