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

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The MERIS Level 1 Full Resolution (FR) product contains the Top of Atmosphere (TOA) upwelling spectral radiance measurements. 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.



European Space Agency, 2020, MERIS Full 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 Information

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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