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ENVISAT MERIS

MERIS Full-Resolution Geolocated and Calibrated TOA Radiance (ENVISAT.MER.FR__1P)


The MERIS Level 1b product is given in radiance units [W sr-1 m-2 micrometers-1] after scaling.

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 15 sun spectral flux values provided in the "GADS Scaling" record of the Level 1b 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 SPH of the Level 1b products are the averaged band-pass of each pixel over the instrument field of view.

The file size is 156 Mbytes per scene and 41 Mbyte per imagette. Auxiliary data include: Orbit state vector, Time correlation parameters, Latitude, Longitude, altitude and topographic corrections, Sun azimuth, Sun elevation, view azimuth, view elevation, dataMean Sea Level pressure, Total column ozone, Total column water vapour, Wind speed.

Product Availability

On request production via FTP

From 24 May 2002 to 08 April 2012

Access to the EOLI-SA catalogue for on-demand ordering is provided upon submission of a project proposal.


Data Set Specifications
Temporal Coverage:
2002-05-17 to 2012-04-08
Spatial Coverage:
90 N, 90 S, 180 W, 180 E
Data Type:
Optical/Multi Spectral Radiometry Low/Medium Resolution
ESRIN - Horizontal Resolution Range:
1 scene, 650 x 582 Km length
ESRIN - Horizontal Resolution Range:
1 imagette, 334 x 300 km length
Processing Level:
Level 1b
More Data Types On
Available Resources Type Format Access
EOLI Catalogue Catalogue HTML   Go to page
MERIS Product Handbook User Manual HTML   Go to page
MER_FR__1P File Structure Product Specifications HTML Download  
MERIS Level 1b Algorithms Technical Note HTML Download  
Product Quality Disclaimer Product Specifications PDF Download  
More MERIS Documents Product Specifications PDF   Go to page
MERIS Products Specifications Product Specifications PDF Download  

Minimize ESA Earth Observation Campaigns Data

ESA has been involved in many Earth Observation campaigns over the past 25 years, from ground-based surveys, to ships at sea, aircraft and balloons in the atmosphere and the orbiting satellites in space.

To learn more about these campaigns and available datasets from them, please see the Campaigns page.