GOES-East Downward Longwave Irradiance

Operational Near real time product

Estimation of the downward longwave irradiance reaching the Earth surface derived from the data of the imager on board the geostationary satellite GOES. 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 : GOES-E DLI
Product navigator reference :


OSI SAF producer : Météo-France
Identifier : OSI-305-b
Acronym for EDC (APNM) : ODDLISSI
Processing level : L3
Satellite input : GOES-16/ABI
Other input : NWP outputs (temperature and humidity profiles), cloud classification
Frequency : 24 per day + 1 per day
Central time : 00:00, 01:00, …, 23:00 – 12:00
Timeliness : 2 h
Spatial coverage : West Atlantic East Pacific : 60N-60S 135W-15W
Spatial sampling : 0.05° Lat-Lon
Projection : Cylindrical equidistant
File Formats : LML FTP Server (NetCDF4), EDC (NetCDF4), EUMETCast (NetCDF4)
Data Access
Main Diffusion Means : LML FTP server (hosted by Ifremer) :
backup LML FTP server (last 7 days) :
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.
Authorised to be operational / released :
Declared operational / released since :
On EUMETCast since :
On EDC since :
On FTP server since :
First date :
  • This product supersed OSI-305-a (temporary product, processed with a temporary chain previously processing OSI-305) on 19/01/2019.

  • EUMETSAT product navigator reference for daily product :

  • Product based on the GOES-East data received in the OSI SAF production centre (Météo-France Lannion) directly from the satellite

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