- Envisat MERIS Full Resolution ...
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.
DATA SET SPECIFICATIONS
- European Space Agency, 2020, MERIS Full Resolution L1 Product. 4th Reprocessing.https://doi.org/10.5270/EN1-w5xkqmx
APPLICABLE TERMS & CONDITIONS
Utilisation of this data is subject to ESA's Earth Observation Terms and Conditions.
MERIS Auxiliary Data
MERIS Sentinel 3-like L1/L2 Product Format Specification
MERIS 4th Data Reprocessing Information
More MERIS Documents
MERIS Software and Tools
Description of Envisat Mission
Description of MERIS Instrument
ESA Earth Observation User Services Portal
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