Meteosat Downward Longwave Irradiance

Operational Near real time product

Estimation of the downward longwave irradiance reaching the Earth surface derived from SEVIRI data on board the geostationary satellite Meteosat. Algorithm is a bulk parametrization that uses NWP model outputs to calculate a clear sky Downward Longwave Irradiance (DLI), corrected according to satellite derived cloud information.
The hourly product is interpolated at rounded UT hours, by a pixel dependant temporal interpolation between two consecutive satellite images.
The value in the daily product is the integration of all the hourly values in the UT day.
The product is remapped onto a 0.05° regular grid and expressed in W/m2.

Acronym : MET DLI
Product navigator reference :


OSI SAF producer : Météo-France
Identifier : OSI-303-a
Acronym for EDC (APNM) : ODDLISSI
Processing level : L3
Satellite input : Meteosat-11/SEVIRI
Other input : ECMWF outputs (temperature and humidity profiles), cloud classification
Frequency : 24 per day + 1 per day
Timeliness : 2 h
Spatial coverage : East Atlantic, West Indian: 60N-60S 60W-60E
Spatial sampling : 0.05° Lat-Lon
File Formats : LML FTP Server (NetCDF4), EDC (NetCDF4), EUMETCast (NetCDF4)
Characteristics & methods : W/m². Bulk parametrization
Data Access
Main Diffusion Means : LML FTP server (hosted by Ifremer) :
backup LML FTP server (last 7 days) :
Other means :


Accuracy Requirements
Target accuracy : monthly (TBC) relative absolute mean difference: 5%, monthly relative standard deviation :10%
Verification/validation method : routine comparison with pyrgeometer measurements
Applications and users
Usage : Ocean atmosphere studies.
Declared operational / released since :
On EUMETCast since :
On EDC since :
On FTP server since :
First date :
  • From 19/01/2021, processed with a new chain, using cloud products from NWC SAF software v2018

  • Replaced OSI-303 based on Meteosat-10 input on 20 February 2018

  • EUMETSAT product navigator reference for daily product : EO:EUM:DAT:MSG:OSI-303-D

  • Using cloud type from NWC SAF software v2016

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