Envisat - SCIAMACHY: New Level 1b dataset version 8 available
06 May 2016
The Level 1b re-processing campaign of the full Envisat-SCIAMACHY mission (from 02/08/2002 up to 08/04/2012) has been completed with the instrument processor version 8.
The re-processed data (SCI_NL__1P) are made available to the user community for direct download via the ESA centralised dissemination service (DissHarm). The previous dataset (Level 1b version 7.04) will remain available until further notice at the D-PAC archiving centre on the eoa-dp.eo.esa.int server (login credentials remain unchanged).
Access to SCIAMACHY products can be provided through ESA Fast Registration.
Users already having access to SCIAMACHY Level 1b data can retrieve the details for the new account on DissHarm via the "My Online data" area (on the My Earthnet pages) using their dedicated SSO credentials.
The new Level 2 full mission reprocessing campaign (version 6.01), using as input the new SCIAMACHY Level 1b version 8 dataset, is currently on going with an expected data release of end 2016.
The following algorithm changes have been implemented in the Level 1b version 8 processing baseline, compared to earlier version 7 data:
More information on SCIAMACHY can be found on the SPPA website.
The SCIAMACHY consolidated Level 1b version 8 dataset is the result of the latest ESA full-mission reprocessing campaign, completed in 2016. The new dataset represents the first complete reprocessing after the conclusion of the in-flight phase of the Envisat mission; it brings significant improvements to the quality of the Level 1b products with a new approach to compensate the instrument degradation.
The reprocessed dataset covers the whole operational mission lifetime period, from 2 August 2002 up to 8 April 2012.
SCIAMACHY Level 1b version 8 products are identified by the fields reported in the table below. More than one software version and processing centre are indicated, as corrective delta processing was necessary to generate the full-mission dataset.
Users of SCIAMACHY Level 1b products are strongly recommended to migrate to the new reprocessed version 8 dataset.
According to the new product specifications, the file format of the new Level 1b products has been updated and it is available online. Size and structure of the ASCII headers (SPH Data Set Descriptors) have been revised to reflect the usage of the new calibration database in place of auxiliary data files.
The Basic Envisat Atmospheric Toolbox (BEAT) and related software have been updated accordingly, allowing fields' extraction and data handling. Latest versions of the tools are: BEAT v.6.9.1, VISAN v. 3.11.0 and CODA v. 2.16. In order to use CODA with the SCIAMACHY Level 1b version 8 data, a new CODA definition file ENVISAT_SCIAMACHY-20140916.codadef specifying the new format, has to be used.
A new version of the SCIAMACHY Calibration and Extraction Tool (SciaL1c 3.2) has been developed to calibrate the Level 1b version 8 products and is now available to the users. The SciaL1c tool incorporates new features adjusted to needs of the next Level 1b-2 processing baseline (SGP version 6.01). In particular, it applies a new hot pixel mask detection algorithm and was adjusted reflecting the modified calibration scheme: degradation and etalon correction is now performed in the Level 0-1 processing step via m-factors (previously during Level 1-2 processing). Executable files as well as complete documentation can be found here.
More detailed information on all changes implemented for the reprocessing campaign with baseline version 8 is available on the ESA Sensor Performance, Products and Algorithms portal.
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