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 274 of 350 single access point to all the PDGS archived content keeping the necessary references to the archive sources. 6.9.1.2 Data Index Composition The DAX function will host all the required information needed to support the data-location requests and assemble the Sentinel-2 products. Such information is the hereafter called “data indexes” and it is generated from the distributed archives inventoried metadata. The data indexes encapsulate the PDGS federated nature and manage the potential redundancy of the archived data available in different archives: The DAX function consolidates the metadata, identifying potential redundancies (same product data available on different archive centres), and normalizes it as part of the data indexes generation activities; The DAX function keeps trace to all the sources (i.e. the different archives) available to support the data retrieval operation of every component of the product data. The data indexes will make use of different product components metadata and will typically include: Product-type Sensing-time coverage Archive sources (data-sinks location) The supported data discovery requests based on the data indexes can be classified in: Data availability request. A view on the available data according to the request criteria is provided hiding data redundancies if any; Data location request. References to the data physical location within the archives are provided to support data retrieval activities. Therefore the data indexes will replicate as required the metadata inventoried in the distributed archives to support queries on the location of the product components archived on the different centres. 6.9.2 OPERATION CONSTRAINTS The following operation constraints have been identified: The DAX function will be able to operate in hot-redundancy between remote centres (with a DAX function backup instance); As a federation function, the DAX function will systematically interface to newly deployed archives centres and in consequence assume additional indexing load; The DAX function will be able to support a growing number of simultaneous request in result of a potential increase of data-access requests; The DAX function will be centrally deployed in a PDGS single access point that will be mirrored for redundancy. 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 275 of 350 6.9.3 OPERATION SCENARIOS 6.9.3.1 Data Indexes Configuration This scenario stands for the operator-driven required configuration activities prior to the function nominal operations. As such, the function configuration items, likely archive sources, metadata extraction/processing parameters, etc are defined and configured providing in addition a view of the whole PDGS archive map, with all the archive centres and the associated data-sinks. Additional configuration activities are covered within this scenario as for instance, the reception and activation of required auxiliary files (i.e. orbit ephemeris) for the data indexes generation. 6.9.3.2 Population of the Data Indexes This scenario accounts for the autonomous data indexing activities according to the new archived product components (archived Product Data Items - PDIs -). The DAX function manages (i.e. as such it creates, refreshes, consolidates, sorts) the data indexes on all the PDGS archived data. The following steps are identified for this operation scenario: 1) On every new PDI archived (or removed), the AI function extracts the relevant metadata and generates an “archive report”; 2) The archive reports are made available to the DAX function by the MCC function; 3) The DAX processes the archive reports and the associated metadata. The data indexes are updated accordingly verifying potential duplications of the same product component; 4) Storage of the browse images of the associated metadata as supplied by the AI function. All the archive updates are processed in order to maintain an up-to-date index of all the available production. The data indexing activities cover as well the data archived by the LTA service function. 6.9.3.3 Consolidation of the Data Indexes This scenario accounts for the autonomous consolidation activities of the content of the data indexes. The DAX function consolidates the data-indexes by identification of the potential duplications, rationalise the storage of the metadata and browse images. As part of this operation scenario, the DAX function notifies to the PDGS front-end services the new available data. The following steps are identified for this operation scenario: 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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