Find more Data

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

Data

13 Jul 2020

DOWNLOAD DATA Dataset access immediately available after Fast Registration submission.

blue arrow DESCRIPTION

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.

blue arrow DETAILS

blue arrow DATA SET SPECIFICATIONS

Digital Object Identifier (DOI): European Space Agency, 2020, MERIS Full Resolution L1 Product. 4th Reprocessing. https://doi.org/10.5270/EN1-w5xkqmx

Spatial coverage: 

90 N, -90 S, -180 W, 180 E

Temporal coverage:

2002-05-17 - 2012-04-08

Date of launch:
2002-03-01
Operators:
ESA
Mission status:
Completed
Orbit height:
800 km
Orbit type:
Sun-synchronous
Swath width:
5 - 1150 km
Resolution:

MERIS FR - 260 m across track / 290 m along track

blue arrow PROCESSING LEVEL

Level 1b,

blue arrow HOW TO ACCESS THIS DATA

Open access

All MERIS data from the 4th reprocessing is available to the user community via the ESA Envisat MERIS Online Dissemination Service

blue arrow APPLICABLE TERMS & CONDITIONS

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

READ T&C

blue arrow RESOURCES

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
Other
MERIS Software and Tools
Tools
Get Help?
ESA Earth Observation User Services Portal
Envisat mission
Description of Envisat mission
MERIS instrument
Description of MERIS instrument