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GOME level 1 Calibrated and Geolocated Spectra Product
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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/".
Data Set Specifications
How to access this data
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
How to access EO data
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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.