GSC Sentinel-2 PDGS SRD - emits - ESA

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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 118 of 204 S2-PDGS-DAX-010 The PDGS/DAX function shall be able to generate, manage and maintain along-time an index of all product data items archived in the PDGS maintaining inner relationships to each of their singular physical data-access points. S2-PDGS-DAX-015 The PDGS/DAX function shall be able to ingest the archive update reports provided by several physically distributed instances of the AI function and to consolidate them in the master index. S2-PDGS-DAX-020 The PDGS/DAX function shall be able to identify and manage redundant / replicated archived product data items that may be located on different archive centres. S2-PDGS-DAX-025 The PDGS/DAX function shall organise the master index in a hierarchy mapping the relationships between the parent-products (covering a complete orbit stripline in a given MSI mode), and their decomposition into several geographically scattered granule components, datastrip components, orbit components, and global components (e.g. auxiliary data). S2-PDGS-DAX-030 The PDGS/DAX function shall be able to discriminate amongst several versions of the product data items generated within different contexts (e.g. with different processor version, different auxiliary data, etc) and manage them as distinct items sharing common properties. S2-PDGS-DAX-035 The PDGS/DAX function shall be able to generate automatically asynchronous catalogue updates (for addition, modification or removal) mirroring the contents of the PDGS archives and to supply them in real-time to the Front-End service functions. S2-PDGS-DAX-040 The PDGS/DAX function shall generate the catalogue metadata items at the level of the product granule to allow for fine geolocation queries over the mission data catalogue. Each catalogue update shall be characterised at minimum by: a unique identifier for each distinct cataloguable item; the availability property (on-line, off-line, unavailable); the sensing and generation times; the native dataset association (S2MSI0, S2MSI1A, S2MSI1B, or S2MSI1C); a list of key metadata such as satellite identifier, dataset version (processing version), usage category (e.g. cal/val, general use, expert, etc), cloud cover percentage over the granule area, quality flags, etc; © 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.
the geographical footprint of the data; the geographical footprint of the cloud-mask; GSC Sentinel-2 PDGS SRD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-RD-09-0028 page 119 of 204 the parent-product identifier used for granule to product associations in the catalogue. S2-PDGS-DAX-045 The PDGS/DAX function shall prevent the repeated generation of catalogue updates for catalogue metadata items corresponding to several physically duplicated instances of the same logical item. S2-PDGS-DAX-050 The PDGS/DAX function shall be able to generate asynchronous consolidated updates of the Sentinel-2 preview images and provide them (or a well-defined mechanism to access them) to the Front-End Service functions. S2-PDGS-DAX-055 The PDGS/DAX function shall prevent the duplicated generation of preview-image updates to the Front-End Service functions. S2-PDGS-DAX-060 The PDGS/DAX function shall maintain and mirror in simplified catalogue updates the changes in the availability property of the product data (on-line, off-line, unavailable) reported by the singular archives in the archive update reports. S2-PDGS-DAX-065 The PDGS/DAX function shall prevent the repeated generation of catalogue updates for catalogue items corresponding to several physically duplicated instances of the same logical item. S2-PDGS-DAX-070 The PDGS/DAX function shall be able to automatically generate and supply to the CDS/SCI the Sentinel-2 products coverage reports based on the catalogue updates. S2-PDGS-DAX-075 The PDGS/DAX function shall provide a query interface remotely accessible and resolving the physical access location of the product data available for retrieval throughout the PDGS archives. S2-PDGS-DAX-080 The PDGS/DAX function shall be able to support simultaneous data location requests. S2-PDGS-DAX-085 The PDGS/DAX function shall be able to backup, export and restore the master index totally or partially according to flexible criteria (e.g. last year records). 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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Appendix B D O C U M E N T document
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GSC Sentinel-2 PDGS SRD - emits - ESA

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