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MERCI - Operational Management of MERIS and AATSR large data archives

Thomas Block(1) and Carsten Brockmann(1)

(1) Brockmann Consult, Max-Planck-Str. 2, 21502 Geesthacht, Germany

Abstract

MERCI has originally been developed as MERIS Catalogue and Inventory, software system to manage, quality control and process MERIS data regardless of the data volume and regardless of the storage media. MERCI has evolved towards a multi-instrument system and is now used by ESA to make all 5.5 years of MERIS L1b and L2 data online, to manage and distribute the complete reprocessed ATSR-1, ATSR-2 and AATSR archive with more than 80 TBytes of data, and will be used to provide online access to the ESA rolling archives of MODIS, AVHRR and SeaWiFS. MERCI is also used by numerous non-ESA clients to manage their local archive of MERIS or AATSR data.

MERCI provides all functions for data acquisition, registration, quality control, product query, child product generation and dissemination. MERCI comes with a Web-Interface to make the satellite data accessible from any place on the world. MERCI capabilities are as follows:

- Product registration: Satellite data coming from any source media (CD, DVD, Satellite Link) are registered in a product database and organised in a file repository.

- Quick-Look generation: During product registration, a quick-look and thumbnail image are generated and available through the Web Interface.

- Statistics: A large number of statistical information are generated during registration: blank lines, number of flags set, averages of band values.

- Automated Quality Control: Tests can be defined on the statistics to perform quality control of products during registration. A final “yes/no” is calculated and the test details are available through the Web.

- Product query: A powerful query interface includes a time and location facility, an interactive map for searching relevant products from the archive as well as the possibility of obtaining statistics parameters.

- Child product generation: Working on the quick-look image a subset of a full orbit product can be selected and generated and downloaded on-the-fly.

- Pre-Defined sites of interest: Fixed areas of interest can be defined which are automatically extracted from full orbit products.

MERCI can be ideally used to obtain data from the ESA rolling archives, including the Full Swath Full Resolution archive, to extract systematically products over an area of ointerest and to submit these products to further processing, such as Level 3 product generation.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry