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 280 of 350 2) The DAG function parses the request and selects the processing centre by making use of the DAX function to optimise the hosted-processing activities based on the physical location of the items to process; 3) The DAG function triggers hosted-processing activities by making use of the DPC function interface(s); 4) During the processing, the DAG function tunnels the monitoring and control flow between the MMUS client and the DPC server(s); 5) At the term of the processing, the DAG function collects the hosted-processing output products and makes them available for download; 6) The MMUS function is invoked to trigger the effective download of the products. 6.11 Multi-Mission User Services (MMUS) Operations 6.11.1 PRINCIPLES 6.11.1.1 Client/Server Approach The MMUS function follows a client/server approach as described in [RD-44]. The MMUS function client side is in charge of handling the user interactions meanwhile the server side implements the logic function behind the scenes. The MMUS function client-side, as explained in the following sections, supported by other PDGS functions, represents the PDGS front-end towards the users. As described in [RD-44], the MMUS function, the MMUS function client-side is separated into: ‣ Web Browser Client: supporting the product discovery request by the user and subsequent product download; ‣ Download Manager: supporting the automation of the products download and hostedprocessing requests. The MMUS function server side, interfaces with other PDGS functions for the autonomous reception of the relevant information to conform the Sentinel-2 product catalogue. As described in [RD-44], the MMUS function server side is separated into several components here highlighted the ones with direct interaction with the other PDGS functions: ‣ ngEO-Feed: for the autonomous collection of the Sentinel-2 catalogue data (products metadata and associated browse images); ‣ ngEO-Catalogue: to catalogue the Sentinel-2 production based on the supplied metadata; ‣ ngEO-Browse Images Archive: to archive the Sentinel-2 browse images of the available production; ‣ Gateway towards the SSO infrastructure for the users authorisation and authentication; 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.
ESA UNCLASSIFIED – For Official Use GSC Sentinel-2 PDGS OCD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-TN-09-0008 page 281 of 350 ‣ Gateway towards the CDS/DAIL in support of the HMA cataloguing and ordering service. 6.11.1.2 Role Split with the DAG Function The MMUS function catalogues the Sentinel-2 production in order to support the product queries performed by the users and subsequently offer an on-line download interface. As explained in section 6.10.1.3, the MMUS function will make use of the DAG function to perform the actual downloads. 6.11.2 OPERATION CONSTRAINTS The MMUS function, although it has a multi-mission nature, it must cope with some mission specific design drivers in order to be able to perform the related product presentation and subsequent management of the product download activities. More concretely, the MMUS function will manage the Sentinel-2 product breakdown strategy (i.e. product decomposition into granules and tiles, cf. [RD-07]) as part of the catalogue activities and subsequent product discovery and download activities triggered by the user. 6.11.3 OPERATION SCENARIOS 6.11.3.1 Sentinel-2 Users Management This operation scenario stands for the operator-driven (administrator level) management of the Sentinel-2 users including definition of profiles, users pre-registration activities, accessleverage definition, etc. Accordingly the MMUS function operation will administrate the access to the users, and their related authentication and authorisation activities. 6.11.3.2 Sentinel-2 Datasets Management This operation scenario stands for the operator-driven (administrator level) management of the Sentinel-2 production datasets (i.e. product collections) offered to the users. As part of this scenario, it is comprised the definition, publishing, update and removal of the different Sentinel-2 datasets. This scenario includes the appropriate definition of the access leverage to such datasets according to the different user profiles. The MMUS function operator will define the Sentinel-2 datasets and the access leverage according to the HLOP covering typically: ‣ Datasets definition based on time-window and geographic coverage; ‣ Datasets definition based on the cloud-cover percentage; ‣ Datasets definition based on the product-type; ‣ Datasets envisaged for the expert and cal/val users. © 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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