Envisat MERIS Full Resolution - Level 1 [MER_FRS_1P/ME_1_FRG]

How to Access Data

Users can freely access the collection using the below links and will be requested to login (new users shall register) to ESA EO Sign In to download the products.

ESA internal users can use their ESAAD account.

The products are available for download via the ESA Envisat MERIS dedicated Online Dissemination Service

The service provides the latest reprocessed version (v4) of the MERIS Full Resolution (FR) and Reduced Resolution (RR) Level 1 and Level 2 data. The data is collection based and allows data browse and download through the treeview as well as via geographical catalogue search based on area of interest and metadata. Data download is available via HTTPS, including bulk download functionality.

FTPS access is available via common FTP clients using implicit FTP over TLS and your own EO Sign In credentials. For internal ESA users the ESAAD account cannot be used.

For further information about the EO Sign In Service you can visit TellUs

Should you need support please contact EOHelp



The MERIS Level 1 Full Resolution (FR) product contains the Top of Atmosphere (TOA) upwelling spectral radiance measures. The in-band reference irradiances for the 15 MERIS bands are computed by averaging the in-band solar irradiance of each pixel. The in-band solar irradiance of each pixel is computed by integrating the reference solar spectrum with the band-pass of each pixel.

The MERIS FR Level 1 product has Sentinel 3-like format starting from the 4th reprocessing data released to users in July 2020.

Each measurement and annotation data file is in NetCDF 4. The Level 1 product is composed of 22 data files: 15 files containing radiances at each band (one band per file), accompanied by the associated error estimates, and 7 annotation data files.

The 15 sun spectral flux values provided in the instrument data file of the Level 1 products are the in-band reference irradiances adjusted for the Earth-sun distance at the time of measurement. The band-pass of each pixel is derived from on-ground and in-flight characterisation via an instrument model. The values "Band wavelength" and "Bandwidth" provided in the Manifest file of the Level 1b products are the averaged band-pass of each pixel over the instrument field of view.

Auxiliary data are also listed in the Manifest file associated to each product.

The Level 1 FR product covers the complete instrument swath. The product duration is not fixed and it can span up to the time interval of the input Level 0 (for a maximum of 20 minutes). Thus the estimated size of the Level 1 FR is dependent on the start/stop time of the acquired segment.

During the Envisat mission, acquisition of MERIS Full Resolution data was subject to dedicated planning based on on-demand ordering and coverage of specific areas according to operational recommendations and considerations. See yearly and global density maps to get a better overview of the MERIS FR coverage.



Digital Object Identifier (DOI):

Spatial coverage: 
90 N, -90 S, -180 W, 180 E
Temporal coverage:
2002-05-17 - 2012-04-08
Date of launch:
Mission status:
Orbit height:
800 km
Orbit type:
Swath width:
5 - 1150 km
MERIS FR - 260 m across track / 290 m along track


level 1b


Utilisation of this data is subject to ESA's Earth Observation Terms and Conditions


blue arrow DATA CITATION

European Space Agency, 2020, MERIS Full Resolution L1 Product. 4th Reprocessing.


MERIS auxiliary data
Auxiliary Data
MERIS Sentinel3-like L1/L2 Product Format Specification
Product Specifications
MERIS 4th Data Reprocessing Information
Product Specifications
More MERIS Documents
MERIS Software and Tools
Envisat mission
Description of Envisat mission
MERIS instrument
Description of MERIS instrument
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