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 170 of 350 4.8.1.1 Collaborative Data-Access Mirroring Centres This opportunity aims at contributing to enhancing the global Sentinel-2 data-access availability, reliability and performance by locally mirroring the data from third-party operated premises in counterpart of a privileged access to Sentinel-2 data products. This collaborative opportunity is motivated by the demonstrated successes of digital media sharing opportunities offered throughout the internet, further complemented by the trends advertised by internet carriers in optimising the effective bandwidth by replication and localisation of the data close to its consumers. From the PDGS system point of view, collaborative data-mirroring centres will be seen as an extension of the PDGS operationally supplied with Sentinel-2 products and contributing to the harmonised on-line publishing of the data they hold locally by implementing the PDGS dataaccess protocols. From the collaborative centre point of view, the core PDGS will act as primary data supplier granting privileged access to large quantities of Sentinel-2 data products reusing the PDGS standard cross-archives data-circulation mechanisms (cf. section 4.5.4.9). In addition, the core PDGS will provide operational data-management software to be hosted and operated locally for receiving, housekeeping and relaying the data internally to legacy systems as well as externally to GSC users. A dedicated PDGS service will be defined and operated to enable this type of collaboration (cf. section 4.10.2.1). 4.8.1.2 Hosted Processing Collaboration Opportunity The Sentinel-2 PDGS will provide a dedicated service to data users enabling their data processors to be hosted and run in the PDGS processing environment. This collaborative opportunity fosters the development of additional products to complement the base product list provided through the core PDGS services. It is motivated to a large extent by the recent experience at ESA in this domain (cf. section 4.3.5.4) and as such aims for a significant reuse of the established concepts applicable to the G-POD CAT-1 opportunity (cf. [RD-36] and [RD- 37]). The goal of this service is to foster the use of Sentinel-2 data and the development of new derived operational products by enabling the remote access and processing of PDGS core products according to user-provided algorithm implementations. This service ultimately aims at enhancing the PDGS offerings vis-à-vis the GSPs indirectly or directly: ○ Indirectly through collaborations with scientific research partners whereby new and complementary Sentinel-2 value-added products (e.g. Level-2) can be test-bedded, validated on large datasets, and finally swiftly transferred to sustainable operations for global usage. This collaborative approach avoiding bulk product transportation commonly required for algorithm development aims at solving data-access bottlenecks while making new processors ready for swift operational deployment when required; 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 171 of 350 ○ Directly through collaborations with the GSP entities themselves whereby their proprietary value-added processors can be hosted in the PDGS and remotely operated either on-demand or systematically on the incoming Sentinel-2 data-flow. Since it is expected that most information products likely to be developed by GSPs from Sentinel-2 data will be substantially reduced in size compared to the base products (e.g. land classification maps, flood extents, etc), this approach will contribute to solving data-access issues (and associated large-bandwidth network demands) by transporting the user processors close to the data source instead of the opposite. The hosted-processing collaboration opportunity will include options targeting specific usage and mode of operation: ○ A first option to provide on-demand triggering capability of the user-provided processors on the available data. Triggering will be managed and performed by the users themselves after an initial step required for processor integration in the PDGS. ○ A second option targeting the automated triggering of the user-processors on the incoming data flow for the autonomous generation of value-added products. The valueadded products will be generated automatically on the available input flow and put at disposal for download. In both scenarios, the generated products may benefit each peer collaborative entity alone, or a wider community as agreed in the collaborations. The first on-demand processing option is targeting either: ○ The development of value-added applications requiring interactivity or applicable only under certain circumstances (e.g. a crisis event), whilst needing large volumes of data in input summarised by processing into a lightweight comprehensive product. ○ The interactive test-bedding and validation of new algorithms as a preliminary step towards a potential sustained processing under the second scenario. The second automated production scenario is enabling the generation of bulk datasets with the objective of either: ○ Avoiding massive data distribution to the users by performing production on their behalf provided the valued-added products have a substantially reduced volume compared to the one of the source data (e.g. data mining, land classification, etc); ○ Offering research partners with the possibility to mature and validate new processing algorithms by applying them on large datasets possibly spanning several years and corresponding to various measurement conditions; ○ Gradually enhancing the portfolio of GSC available datasets with new and mature value-added products under a collaborative IPR scheme. The service model enabling the collaborations will follow a shared workflow with a welldefined role-split between the PDGS operators and the collaborative partners inherited from the one in-place for G-POD CAT-1 opportunity implementations as recalled on Figure 4-31. 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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3.5.2 MULTI-SPECTRAL INSTRUMENT CHA
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Product- Type On-Line retention Off
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o preserving integrity of exchanged
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6 DETAILED OPERATIONS CONCEPTS GSC
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○ MSI L1A, L1B, L1C and TCI produ
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Some relevant use cases are present
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Two main mapping services have been
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The requirement on the cloud covera
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GSC Sentinel-2 PDGS OCD - Emits - ESA

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