MTG User Test Data

To support the user community in their preparations for receiving and processing the MTG data test data are being made available.

To ensure user readiness, it extremely important that users have access to data that will, in a best possible way, resemble the data that will be available from the future instruments.

Test data of that kind should have the best possible maturity in data content and in format specifications attached to different data. This is valid both for the pre-launch development period and during post-launch commissioning activities.

User test data can take different form, for instance having more or less scientific values, formats and sizes. However, different test data can be associated with different user preparation processes, from tailoring of data acquisition systems to visualisation and utilisation of the satellite data in an operational environment.

Released test data packages and support data

InfraRed Sounder (IRS)

On 12 December 2019, a simulated Level 1B dataset of the Infrared Sounder (IRS) which will fly on Meteosat Third Generation sounding satellites (MTG-S) is now available for user familiarisation.

Dataset description

The dataset consists of a IRS dwell containing Level 1B spectra in native and Principle Component form, provided in netCDF format in line with the current IRS Level 0 and 1 Format Specification.

It is intended for format familiarisation and system testing.

Package usage

FTP access:

Flexible Combined Imager (FCI)

The June 2019 release of simulated Meteosat Third Generation (MTG) Flexible Combined Imager (FCI) Level 1C data covers a 24-h period and is based on SEVIRI proxy data. These test datasets are intended for format familiarisation and system testing purposes.

Dataset description

Figure 1
Figure 1: Simulated full disk FDHSI product, “vis_04” channel effective radiance, 10th April 2017, midday

The term 'dataset' refers to a number of files or 'chunks' associated to a FCI repeat cycle (one complete 10-minute Earth disc scan = one repeat cycle). Each dataset comprises several body chunk netCDF-4 files that contain observational data, one trailer chunk netCDF-4 file, and one RGB composite quick-look png file.

These proxy datasets are based on MSG SEVIRI data. They are in the final format and are highly representative of an operational FCI Level 1C dataset. They are intended for format familiarisation and system testing purposes.

Package Usage

FTP access:

The datasets are provided in compressed and uncompressed versions:

  • Compressed version: The radiance data are compressed with the CharLS algorithm, as they will be when disseminated to users in near-real time during MTG operations. The ‘Compressed’ directory contains a set of tarred and zipped sub-directories (each one contains all the product chunks for a repeat cycle). There are also two check sum files (one for each repeat cycle and one for all chunks).
  • Uncompressed version: This is how the data will be archived. The ‘Uncompressed’ directory is set up in the same way as the ‘Compressed’ directory.

In addition, the following is provided on the FTP:

  • A decompression software, together with an installation guide and a user guide.
  • MTG EUMETCast simulator: The MTG EUMETCast simulator simulates the delivery of MTG products to a EUMETCast reception station. It uses 24 hours of MTG FDSS-FCI L1C test data and transfers the files to a specified target directory on EUMETCast reception station using ftp protocol, in the exact time of their delivery via EUMETCast.


Title Type Reference Ver
MTG FCI L1 Product User Guide [FCIL1PUG] PUG EUM/MTG/USR/13/719113 1H
MTG Test Data Package Description - FCI L1C - 24h Test Data for Users   EUM/MTG/TEN/19/1090563 1A

Earlier releases of FCI user familiarisation test data

2017 Release: FTP access:

2015 Release: FTP access:

EUMETSAT recommends use of the 2019 releases of FCI L1c test data.

Planned Test Data Packages and Support Data


FCI L1C Format Familiarisation — Q1 2020

A subset of the June 2019 test dataset with more realistic representation and enhanced scientific value, and including non-nominal cases (e.g., missing data).

LI Level 2 Familiarisation — Q1 2020

Simulated dataset covering a 30-second period, for format familiarisation by users.


Test Data are released exclusively for the purposes of facilitating user-preparedness. They are not to be used for operational purposes, nor are they to be cited in scientific publications or disclosed through unauthorised public channels and internet platforms. For further information please consult the Terms of Use for Special Provisions: Test Data.

By continuing to use this website, you are giving consent for EUMETSAT to store certain information about you. To learn more about what information EUMETSAT collects and how it is used, please view our Terms of Use page.