GSC Sentinel-2 PDGS OCD - Emits - ESA

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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 150 of 350 Operator driven inter-archive circulation will be possible to recover from contingencies or to execute specific cross-archive circulation operations (e.g. as required for reprocessing activities). In complement, the above operations will provision for the operational data supply towards potential collaborative entities operating a PDGS compatible data-access mirror centre (cf. sections 4.2.6 and 4.8). 4.5.4.9.1 Data Archiving Operations In the distributed PDGS context, data archiving will make use of two type of facilities: ○ Medium-term archives, designed for high performance accessibility to the distributed dataset in short time after processing on-ground. These archives will be located either at the ground-stations or in dedicated centres to provide on-line accessibility over a mission time period covering typically one year of Sentinel-2 constellation data in a rolling buffer. ○ Long-term archives, designed for long-term accessibility of the global dataset and reliability through full redundancy. The scattered medium-term archives will comprehensively provide: ○ Access to RT, NRT and all daily nominally acquired and processed data-products at the ground-stations. Ground-station archives will be sized to hold about one month of recent data products from the constellation in a rolling buffer. ○ Access to data-products aged by up to one year after satellite sensing. All systematic product collections (S2MSI0, S2MSI1A, S2MSI1B, S2MSI1C) will be retrievable from these archives with on-line access latencies as baselined in section 4.4.6. The long-term archives will comprehensively provide full redundant access to the global S2HKTM, S2MSI0, S2MSI1B and S2MSI1C datasets with off-line access latencies. The S2MSI1A collection will not be archived in the long-term. 4.5.4.9.2 Data Circulation Operations PDGS data-circulation operations will be used to supply in a data-driven manner the mediumterm and long-term archives from the source archives distributed in the CGS network. The data-driven circulation rules will operate systematically on the PDIs and dictate their systematic routing across centres according to the following granularity attributes available at any product-level: ○ Spacecraft unit; ○ Product type; ○ Timeliness (RT, NRT or else); ○ Geo-location at product granule level; ○ Cloud-cover at product granule level; ○ Summary quality indicators set at product granule level or group of granules; ○ Specific MSI acquisition mode flags used for Cal/Val activities (cf. 4.5.4.10.2); © 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 151 of 350 Three types of physical data transportation means will be supported for internal datacirculation providing for trade-off: ○ Ground network, considering that ground-lines supporting a throughput of up to about 100Mbps will be available at reasonable operation costs in the 2013 timeframe. ○ Satellite multicast via the EDRS data-repatriation transponders, considering the availability of the shared EDRS data-repatriation capability with 220Mbps throughput for a third of the total time (cf. [Assumption-13]); ○ Media such as LTO tapes or USB devices (e.g. removable hard disks); Circulation via physical media is currently accounted for as a trade-off solution to ensure cost-effectiveness of the global circulation required as not requiring stringent timeliness whilst potentially providing for higher effective throughput at lower operation costs. To guarantee operational effectiveness of this process, media loading, release and labelling operations will be mechanical and the physical flow of media will be controlled modelling an automated transportation network. 4.5.4.10 Cal/Val Operations Cal/Val corresponds to the process of updating and validating on-board and on-ground configuration parameters to ensure that the product data quality requirements are met. To meet the baseline product quality requirements later defined in section 4.4.4, a welldefined Calibration and Validation (Cal/Val) plan will be systematically applied. This section presents an outline of the Cal/Val plan that will be implemented during Phase E2 of each spacecraft. During Phase-E1, a dedicated Cal/Val plan will be specified as part of the Commissioning-Plan. The following paragraphs define each of the Cal/Val operations specific to Level-1 and Level- 2 data. Level-1 Cal/Val operations are divided between Radiometry and Geometry operations. Each one is described with a short outline of the method and details whether it will be carried out automatically by PDGS computer systems, through an operational service offered by an expert Cal/Val team, or by a hybrid semi-automatic combination. 4.5.4.10.1 MSI Decontamination The purpose of the decontamination operation is to get rid of the molecular contaminant on the MSI SWIR focal plane. The MSI decontamination operation consists in heating the SWIR focal plane from the nominal operating temperature (around 200 K) to the decontamination temperature (around 300 K). The typical expected duration of the decontamination operation is approximately 48 hours (cf. [RD-43]); the periodicity is once every six months. During the decontamination operation, the MSI nominal operations are interrupted. The programming of the MSI decontamination will be commanded by a Flight Control Procedure starting with the Instrument from STANDBY, CSM being commanded to open position and applying decontamination heater power for a time period as needed, typically 48 hours (cf. [AD-03]). © 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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○ Effective processing resources
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o preserving integrity of exchanged
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6 DETAILED OPERATIONS CONCEPTS GSC
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Some relevant use cases are present
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