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 148 of 350 production flow and include checks performed autonomously (operator unattended) on every PDGS generated production. Data-access towards general users will be granted based on those essential checks and QC traceability will be embedded in every product under the form of one or several “qualityreports” provided as QI metadata in the product structure. Examples of such QIs are provided in [RD-07]. Even if the systematic QC will be as automatic as possible, complementary visual inspection will be performed daily by the operator on the basis of the preview images to provide a second line interactive quality stamping authorising or preventing distribution beyond the day. In addition, this on-line QC process will be used to perform pre-processing steps in the overall QC chain which immediate results will be fed to the complementary off-line QC process (cf. section 4.5.3.2) running more complex QC algorithms over short to long-term mission periods. The long-term monitoring of the on-board image datation error budget (cf. 4.5.4.5.3.2) is one example of this second-line quality monitoring process using on-line preprocessing to sample the timing information from the instrument raw-data. 4.5.4.8 Reprocessing Operations The PDGS will provision for data reprocessing operations in response to two distinct requirements: ○ Reprocessing campaigns, provisioning for the reprocessing of entire mission periods over the archived data after significant upgrades of the data processing algorithms or of the auxiliary data justifying a realignment of the Level-1 dataset in totality or in parts; ○ Reprocessing as a recovery from contingencies after malfunctions of the real-time chain e.g. at a particular orbit; These two scenarios are separately described in the following paragraphs. 4.5.4.8.1 Reprocessing Campaign Scenario Level-1 reprocessing campaigns will consist in regenerating the S2MSI1C dataset from S2MSI0. During Level-1 processing, the Level-1B data will also be regenerated and maintained in the archives according to the retention policies in place (nominally 1 month) before long-term archiving. Considering the high data volumes generated by the mission, bulk reprocessing campaigns will require large additional hardware resources. To this end, two alternative reprocessing strategies will be proposed according to the volume of data to be reprocessed, whilst possibly followed in parallel: ○ Reprocessing of the data accumulated over typically 6 months on PDGS nominal resources provisioning for a minimum reprocessing capability scalable with hardware; ○ Bulk reprocessing via a specific service procured on-demand at the long-term archives. Those upgrades will be budgeted separately on a case-by-case basis according to the need. 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 149 of 350 The PDGS initial sizing will embed minimum reprocessing capability operating at a production rate of typically 2 days per every full day of accumulated Level-0 data to be regenerated at Level-1C from a single spacecraft. This capability will presuppose that the data to be reprocessed is collocated to the reprocessing hardware which will be ensured separately as relevant via the standard PDGS internal data-circulation mechanisms. Data reprocessing capabilities will be commanded and performed automatically in orbit trunks. The sequence of orbits to be processed will be selected by the centre operator after which the reprocessing chain will operate automatically as for nominal processing on all selected orbits. The automatic scheduling will allow the natural orbit sequence to be reversed allowing for reprocessing most recent data in priority. During reprocessing, the new PDIs generated will be stored and circulated through the nominal path shared with the nominal processing. Unambiguous discrimination of the reprocessing flow from the nominal one will be ensured through the use of a specific identifier embedded in all PDIs and managed down the path in all downstream functions. 4.5.4.8.2 Reprocessing after Nominal Processing Contingency To ensure the reliability of the nominal processing flow, reprocessing operations will be provisioned for in every PDGS centre (including CGS) with the capability to recover from contingencies of the Level-1 productions. The reprocessing capabilities will be sized to allow for the recovery of typically one day of nominal processing within about one week of sustained reprocessing. The commanding and execution of contingency reprocessing operations will be identical to the ones described in the previous paragraph. 4.5.4.9 Data Archiving and Circulation Operations The data archiving and internal data circulation operations aim at comprehensively answering to the global accessibility to the Sentinel-2 datasets featuring: ○ Global product accessibility at the user-bases with optimised access for regional to continental usage; ○ The reliability of the products availability ensured by redundancy; ○ The long-term availability of the products responding to the LTDP objectives outlined in section 4.5.1.6. To this end, the archiving strategy will map the characteristics defined for product accessibility baselined in section 4.4.6 under the timeliness constraints outlined in section 4.4.5. Archiving and data circulation are hence tightly coupled to this objective and will follow the product data handling coordinated strategy defined in section 4.5.2.1. The overall data-archiving and circulation operations within the PDGS will be coordinated towards the global data-access objective. Coupled with the archiving operations, the circulation processes will operate mechanically dictated by the data-circulation rules configured in each centre archive, cascading gradually the PDI data from the source to the destination in a totally data-driven manner. 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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LES LGS Land Equipped Sites Local G
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○ Effective processing resources
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GSC Sentinel-2 PDGS OCD - Emits - ESA

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