GSC Sentinel-2 PDGS SRD - emits - ESA

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5.13 Data Access Gateway (DAG) Requirements GSC Sentinel-2 PDGS SRD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-RD-09-0028 page 124 of 204 5.13.1 FUNCTIONAL REQUIREMENTS S2-PDGS-DAG-005 The PDGS/DAG function shall be responsible for: Managing the download operations of all MSI user-products and TCIs based on the product data available throughout the PDGS, as commanded by the users through the MMUS or OLIB function interfaces; Managing the hosted-processing operations according to the processing system interface capabilities, when commanded by the users through the MMUS function interfaces. S2-PDGS-DAG-010 The PDGS/DAG function shall provide vis-à-vis the MMUS function a single virtual point of access to all Sentinel-2 PDGS products for downloads no matter the physical location of the product elements. S2-PDGS-DAG-015 The PDGS/DAG function shall provide vis-à-vis the OLIB function a single virtual point of access to all Sentinel-2 TCIs for download no matter the physical location of the images. S2-PDGS-DAG-020 The PDGS/DAG function shall provide vis-à-vis the MMUS function a single virtual point of access for commanding and control of hosted-processing activities throughout the PDGS. S2-PDGS-DAG-025 The operations performed through the PDGS/DAG function shall be based on a clientserver protocol operating between the PDGS core infrastructure elements acting as servers and the user base platforms acting as clients separated by a digital network. S2-PDGS-DAG-030 The PDGS/DAG function shall provide a management function federating all physically distributed servers and acting transparently as proxy/router of all transactions with other functions. S2-PDGS-DAG-035 The PDGS/DAG management function be able to run in hot-redundancy between geographically distributed sites. 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 SRD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-RD-09-0028 page 125 of 204 S2-PDGS-DAG-040 The PDGS/DAG function shall be able on request by the MMUS function to perform the end-to-end product download operations by identifying via the DAX function the location of the various product components across the various distributed archives, retrieve them, and assemble them into comprehensive User-Products automatically. S2-PDGS-DAG-045 The PDGS/DAG function shall authenticate each product (non TCI) download request or my making use of the MMUS function authentication service. It shall be possible to bypass the authentication step by configuration (e.g. for testing campaigns). S2-PDGS-DAG-050 The PDGS/DAG management function shall authorise each product (non TCI) download request immediately preceding the effective download my making use of the MMUS function authorisation service. It shall be possible to by-pass the authorisation step by configuration (e.g. for testing campaigns). S2-PDGS-DAG-055 The PDGS/DAG function shall identify the location of the requested product components throughout the archive centres by making use of the location query capabilities of the DAX function. S2-PDGS-DAG-060 The PDGS/DAG function shall make use of the PDI query and supply capabilities of the AI function to retrieve the PDIs satisfying the data download requests. S2-PDGS-DAG-065 The PDGS/DAG function shall assemble the User-Products in structure and format as specified in the [PDD] as part of download operations. S2-PDGS-DAG-070 The PDGS/DAG function shall be able to assemble the User-Products according to the download options provided in the MMUS requests complemented or supplemented by pre-configured default user-defined preferences. S2-PDGS-DAG-075 The PDGS/DAG function shall allow the user to configure its own preferences regarding default product assembly and formatting options. S2-PDGS-DAG-080 The PDGS/DAG function shall assemble in the User-Products a user-defined list of product components specified as download-options, including auxiliary-data, bandseparate image data, metadata, quality indicator data, etc as independent components. © 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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GSC Sentinel-2 PDGS SRD - emits - ESA

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