GSC Sentinel-2 PDGS OCD - Emits - ESA

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GSC Sentinel-2 PDGS OCD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-TN-09-0008 page 262 of 350 6.5.3.2 Electronic Data Circulation This scenario describes the autonomous data circulation operations performed electronically (i.e. network connectivity not involving media usage). The electronic data circulation operations are performed systematically and automatically. They are triggered by a polling frequency on the source interface and performed autonomously without any operator intervention. The following steps are identified for this operation scenario: 1) The DC function retrieves autonomously from the configured source interface new files according to the data circulation rules. If required (data circulation post-retrieval file transformations configuration), file conversions are applied to the new files; 2) The DC function delivers autonomously retrieved files to the configured target interface according to the data circulation rules. All completed data circulation operations will be reported (a data circulation report will be generated for the PDGS/MPA function). Some use cases are presented according to this operation scenario: S2HKTM product data circulation from the PDMC to the FOS; Sentinel-2 products supply for ground link EDRS data circulation. The DC function will provide to the EDRS ground link gateway products to be circulated making use of EDRS capabilities; Between centres data circulation such as the mission reference files circulated from the applicable interfaces to the Payload Data Management Centre; Internal data circulation such as the mission reference files circulation in the PDMC from the MCC function to the RP function. 6.5.3.3 Data Circulation via Media This scenario describes data circulation operations performed using different media devices (e.g. LTO, USB HDD, etc.). It will require operator intervention only for the media volumes management (i.e. media volumes preparation). Nevertheless, the data circulation operations are performed systematically. They are triggered by new data available in the source interface and performed autonomously without any operator intervention except for media volumes handling when required (i.e. media volume full replacement when writing, media volume already processed replacement when reading). The data circulation involving media requires presence of the DC function on both sides of the interface. The following steps are identified for this operation scenario: 1) The operator prepares the interface media volumes (for writing) in the originator DC function; 2) New files are autonomously gathered from the source interfaces according to the configured data circulation rules. If required (data circulation post-retrieval file transformations configuration), file conversions are applied to the applicable files; ESA UNCLASSIFIED – For Official Use © ESA The copyright of this document is the property of ESA. It is supplied in confidence and shall not be reproduced, copied or communicated to any third party without written permission from ESA.
GSC Sentinel-2 PDGS OCD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-TN-09-0008 page 263 of 350 3) The files are autonomously copied into the media volumes. The operator is alerted for media volume replacement when current one is filled-up and a new empty one is required; 4) The media volumes are sent to the destination data circulation function by mail courier; 5) Operator connects / inserts received media volumes that activate the circulation actions. Then files are retrieved from media volumes; 6) The retrieved files are placed in target interface exchange in-trays according to the configured data circulation rules. Some use cases are presented according to this operation scenario when no data availability timeliness constraints are declared: ○ CGS light configuration with poor data repatriation capabilities may rely on the media circulation for the level-0 data supply to the PACs; ○ Archive-to-Archive data circulation via media to fill-up a collaborative centre. 6.6 Auxiliary Data Supply (ADS) Operations 6.6.1 PRINCIPLES The ADS function responsibility is to provision the required auxiliary data to the PDGS for the products generation activities. 6.6.2 OPERATION CONSTRAINTS As having a dependency on the different processing activities performed at the PDGS. Accordingly it inherits the applicable global production timeliness constraints with respect to every processing activity performed and shall therefore autonomously operate in advance. 6.6.3 OPERATION SCENARIOS 6.6.3.1 Auxiliary Data Supply This is the only single operation scenario of the ADS function. It accounts for the ADS function autonomous generation and supply of the PDGS required auxiliary data from external data-sources (e.g. meteorological data for atmospheric correction activities). ADS function autonomous generates required auxiliary data and together with the DC function autonomously makes it available to the applicable PDGS functions and centres via the MCC function (managed as Mission Reference Files). The use case of this operation scenario is the generation and supply of the auxiliary data available from external sources such as: ○ IERS UT1-UTC time correlation data required for the L1 processing activities; ○ ECMWF meteo data to be embedded in the Level-1 products; ESA UNCLASSIFIED – For Official Use © ESA The copyright of this document is the property of ESA. It is supplied in confidence and shall not be reproduced, copied or communicated to any third party without written permission from ESA.
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[RD-33] Sentinel-2 MSI - Level 2A A
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LES LGS Land Equipped Sites Local G
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GSC Sentinel-2 PDGS OCD - Emits - ESA

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