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Earth Topics (Applications)
  • Atmosphere
  • Ozone



    Climate Change/Kyoto

    Instrument type
    Date of Launch:
    ERS-1 - 17 July 1991
    ERS-2 - 21 April 1995
    Mission Status:
    ERS-1 ended on March 2000 and ERS-2 September 2011 
    Orbit Height:
    782 to 785 km
    Orbit type:
    Near-circular, polar, Sun-synchronous
    Swath Width:
    5 km
    GOME level 1 Calibrated and Geolocated Spectra Product
    (1002) recent views
    Last update: 16 February 2017

    GOME Level 1 products contain Earthshine radiance at the Top of the Atmosphere and solar irradiance spectra as raw detector signals (binary Analog to Digital Converted units) of the science measurements plus calibration constants. Level 1 products were generated by DLR on behalf of the European Space Agency with GOME Data Processor (GDP) version 4.0 starting from Extracted GOME Calibration Level 0 data files (EGOC).

    The Level 1 data product includes a header, fixed calibration data, ground-pixel specific calibration parameters, and GOME science data in ten spectral bands. With the different integration times, these bands (six spectrum bands, because channel 1 and 2 are divided into two electronically independent bands; three 'stray light' bands; one 'blind' band) are handled as separate logical units of data. The header includes reference to input data, processing software and pre-flight data versions, time correlation, and orbital information. The fixed calibration data includes leakage current, and noise characteristics, spectral, and radiometric calibration parameters, sun reference spectra, and polarisation sensitivity parameters. The pixel specific calibration parameters include geo-location information, seven fractional polarisation values, and header information retained from the Level 0 data.

    The Level 1 products are generated and released in a sort of compressed format (they contain calibration data plus raw signals as 2-byte integers). The end user has to apply an "extraction" software tool to obtain the final Level 1 data (fully calibrated signals as 4-byte floats plus three 4-byte floats for wavelength, accuracy error and precision error). Using the included calibration data, the ADC readings of the diode arrays in the individual band data records are converted to geo-located, spectrally and radiometrically calibrated radiances, including the correction for polarisation, leakage current and stray light.

    The Extraction Program (gdp01_ex) developed by DLR for version 4.00 data is available on the product FTP-site in the directory "programs/level_1/".

    Product Characteristics
    Conversion to Engineering Units Polynomial coefficients of analog data package measurements and other semantic explanations of the data package content
    Correction for Straylight Centre pixels of ghost columns, their efficiencies and defocussing
    Radiometric Calibration Bi-directional scattering distribution function of the diffuser in the calibration unit, Instrument response function, Polarisation characteristic of the calibration unit
    Polarisation Correction Polarisation sensitivity per pixel, Correction factor for the polarisation sensitivity per pixel to correct for the various scan mirror,positions, Wavelength dependency of the PMDs, the PMD ratios. In-flight calibration data (Leakage current correction, Pixel-to-pixel gain information, Spectral calibration parameters, Sun reference spectra measurements)
    Data Set Specifications
    Spatial coverage: 90 N, 90 S, 180 W, 180 E
    Temporal coverage: 1995-06-27 - 2011-07-03
    Sporadic data since July 2003 due to problems with tape recorder on ERS-2
    Current Processor Version: GDP 4.0
    Processing level
    Level 1
    How to access this data

    Reprocessed data V4. Full mission (from 27 June 1995 to 03 July 2011) is available via FTP upon registration.

    On the product FTP-site the extraction tool GDP01_ex is also available.

    See Table (PDF, 25 KB).

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


    More GOME Documents


    Product Specification document of the GOME Data Processor


    GOME Level 0 to 1 Algorithms Description


    Algorithm Theoretical Basis Document for GOME Total Column Densities of Ozone and Nitrogen Dioxide


    Disclaimer for GOME Level-1 and Level-2 Data Products


    GOME Software Databases for Level 1 to 2 Processing


    ERS-2 GOME Data Products Delta Characterisation Report 1999


    GOME Data Processor Extraction Software