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 108 of 350 4.5.1.6 Long-Term Data Preservation As a background task, the PDGS will ensure long-term data preservation of all Sentinel-2 mission acquired data for at least 25 years after end-of-mission. By complying widely with the draft coordinated European guidelines [RD-18] put in place in the Long-Term Data Preservation (LTDP) area, this service aims at ensuring through a dedicated long-term archive (LTA) function: ○ The reliable storage and inventory in two redundant European sites of all Sentinel-2 raw-data (S2HKTM, S2MSI0), the main user-product at Level-1C (S2MSI1C) and all required auxiliary data (e.g. orbit and AOCS information, GPS data, instrument characterisation data, etc) for the Sentinel-2 missions lifetimes and for at least 25- years after the end of space-segment operations; ○ The collocated reliable storage of all associated project documentation (e.g. algorithms, data formats, etc); ○ The collocated mirror copy of the data-access index globally maintaining the access points of all storage granules held throughout the PDGS and its associated long-term operations; ○ The collocated long-term operations of Data-Access elements to provision for the sustained retrieval of the data beyond end-of-life through several interfaces including the HMA (DAIL) to allow for data-access interoperability; ○ The collocated long-term operations of an automated data-circulation element to provision for the bulk transportation of data, including via media, between LTAs or to other PDGS centres; ○ A collocated long-term operated and maintained reprocessing function allowing for regeneration of all Sentinel-2 products from raw data. The Sentinel-2 PDGS long-term archive function is expected to be hosted in dedicated redundant centres possibly exploiting synergy with the long-term archiving already performed for other Earth-Observation missions. It is further expected that the collaborative opportunity provisioning for the Sentinel-2 interoperable data mirroring through third-party operated centres (cf. sections 4.2.3 and 4.10.2.1) will further contribute to the LTDP objective. In support to the long-term usability of MSI raw-data in particular for reprocessing, the PDGS will provision for the long-term maintenance (>40 years) of the MSI WICOM decompression software. 4.5.1.7 Operational Redundancy and Contingency Handling Concepts As cascaded from the GSC operational context (cf. 4.3.1), the PDGS will provision for redundancy and for contingency operations focussing on guaranteeing the data availability to the end users in a timely and reliable manner. From the operational reliability globally inherited from automation embedded in most PDGS processes (cf. section 4.5.1.3), system redundancy and contingency operations will aim at further improving the quality of the PDGS services. 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 109 of 350 Although not generalised in all PDGS systems, hardware redundancy will be ensured on critical items such as the front-end processors (hot redundant) and will be embedded in the processing infrastructures through the management of a large number of compatible processing nodes. Archive redundancy will be ensured through a multi-site approach provisioning for at least dual redundancy on the overall mission archive. In complement, contingency operations will be provisioned for throughout the dataelaboration processes including data-reception, data processing and archive-to-archive circulation. 4.5.2 DATA ACCESS CONCEPTS 4.5.2.1 Product Data Handling and Data-Access Strategy Throughout the PDGS, the MSI product data will be managed as a set of physical product components hereafter referred to as Product Data Items (PDI). Referring to the Product Definition Document [RD-07], each PDI will be a set or excerpt of the following type of data: ○ Image data ○ Image metadata ○ Image quality indicators ○ Ancillary data (satellite orbit position, velocity, time, attitude) ○ Orbit metadata ○ Auxiliary data (GIPP, etc.) Each PDI will be self-standing as a physical item e.g. a GIPP file, the reflectance image of one band covering one tile, a quicklook image, the ancillary data covering a specific orbit, etc. On the other hand, all PDIs will be organised and referenced within a logical product hierarchy by implementing basic cross-PDI relationships. Examples of such embedded relationships are common in many EO products such as the auxiliary data used for processing, the mission orbit, geo-referencing information on an image subset (e.g. a tie-point grid), summary quality indicators on a set of along-track measurements, etc. Managing PDIs separately brings the immediate benefit of avoiding duplication of information (e.g. global ancillary data usage over an orbit, auxiliary data validity over long periods, etc) wile providing for flexibility in a distributed environment (the data composing one product may be scattered geographically in several remote archives). In the Sentinel-2 PDGS, this concept will be used substantially as an effective answer to the data-access challenge for the seamless provision of data products geographically scattered, with large volumes, and required by the users under stiff constraints for wide ranging applications of regional to continental scale. Based on the federation concept outlined in section 4.5.1.4, the PDIs generated and archived in each PDGS centre as well as circulated between centres will be globally federated allowing the overall PDI hierarchy to be maintained and redundancy to be managed consistently. In counterpart, data-circulation mechanisms between centres will be coordinated ensuring that 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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5 PDGS DESIGN GSC Sentinel-2 PDGS O
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○ Effective processing resources
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o preserving integrity of exchanged
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6 DETAILED OPERATIONS CONCEPTS GSC
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o Report generation frequency and c
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○ MSI L1A, L1B, L1C and TCI produ
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Two main mapping services have been
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GSC Sentinel-2 PDGS OCD - Emits - ESA

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