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Envisat MERIS Reduced Resolution - Level 1 [MER_RR__1P/ME_1_RRG]

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The dissemination 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. For internal ESA users the ESAAD account can be used.

Access to ftps:// 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.

New users can register an account on EO Sign In. For further information about the EO Sign In Service you can visit TellUs.

Should you need support to access the data, please contact EOHelp.


The MERIS Level 1 Reduced Resolution (RR) product contains the Top of Atmosphere (TOA) upwelling spectral radiance measurements at reduced resolution. 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 RR 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 measurements 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 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 1 products are the averaged band-pass of each pixel over the instrument field of view.

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

MERIS was operating continuously on the day side of the Envisat orbit (descending track). RR data was acquired over 43.5 minutes in each orbit, i.e. 80% of the descending track.



Digital Object Identifier (DOI):
Spatial coverage:
90 N, -90 S, -180 W, 180 E
Temporal coverage:
2002-04-29 - 2012-04-08
Date of launch:
Mission status:
Orbit height:
800 km
Orbit type:
Swath width:
5 - 1150 km
MERIS RR - 1040 m across track / 1160 m along track


Level 1b


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



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


Auxiliary Data

MERIS Auxiliary Data

Auxiliary Data

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Product Specifications

MERIS Sentinel 3-like L1/L2 Product Format Specification

Product Specifications

Product Specifications

MERIS 4th Data Reprocessing Documentation

Product Specifications

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More MERIS Documents


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MERIS Software and Tools


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Description of Envisat Mission

Envisat Mission

Description of Envisat Mission

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Description of MERIS Instrument

MERIS Instrument

Description of MERIS Instrument

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