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 198 of 350 ○ As inherited from lessons learnt and taking advantage of the systematic nature of the Sentinel-2 data-acquisition plan, all data-management functions aim at a data-driven mode of operation whereby the data processing down to the delivery for user access is performed as triggered by the data reception at the CGS in a systematic manner. User-accesses are also aimed for a data-driven approach as required by the subscription concept to supply user-products and specific Data-Set compilations directly at the user-base. ○ A specific constraint to the data-driven approach is introduced by the specificities of the MSI instrument which packages the data measurements with spectral-bands delocalised on earth (cf. Sections 4.3.8.2 and 4.3.8.1). A provisional scenario to solve this constraint at space-segment level through an accurate commanding of the MMSU playback operations. Nevertheless, the current baseline scenario for MSI downlinks described in section 4.5.4.2.1.3 currently imposes to circulate raw-data segments between stations on-ground in a reliable way and within the day to ensure the quality and timeliness of all the production. ○ The very large dataflow generated by a single Sentinel-2 spacecraft and doubled 18 months after imposes: o To limit the internal data circulation on-ground while bringing the data “close” to the users on a network accessibility point of view as directly as possible; o Parallel processing capabilities to cope with the dataflow in real-time; o Openness to current and new technologies and their trends in areas such as high-performance computing, digital media storage and delivery over the internet prone to substantially helping with the required gain in performance; o Trade-off solutions for data-access including capabilities for data-product reduction to the strict user needs and the provision for a user-hosted postprocessing capability whereby the users can further reduce the data to their precise downstream usage; o Trade-off solutions for data storage coping with timeliness and data-access required performance on one hand and with the required reliable data accessibility in the long-term on the other; o Trade-off cost-effective solutions for the systematic and reliable data transportation on-ground for optimising user-accessibility and long-term data availability considering wide ranging data circulation supports such as groundnetworks, data broadcast (e.g. EDRS) and media; o Highly-scalable solutions on all above items to cope with the planned doubling of the dataflow and the possible exponential evolution of the user-demand for Sentinel-2 products; ○ Long-term operational sustainability of the PDGS coupled with the large data volumes to be managed imposes a high-level of automation throughout to the datamanagement functions with stiff robustness, limiting operator interventions to the strict necessary; ○ A highly flexible, modular and scalable solution with respect to mission operation evolutions considering an evolving PDGS layout imposing variable characteristics (e.g. © 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 199 of 350 CGS network and accessibility via networks, ground network bandwidth, major user sites, etc); ○ Additional design-flexibility to adapt to the EDRS phase-in for its optimal usage; ○ An open design provisioning for the accommodation of the GSC third-party collaboration opportunities defined in section 4.2.3 to provide for long-term scalability in both data-access performance and range of products supplied; ○ A very high degree of automation requiring only operator supervision throughout the data-elaboration chain from the antenna to the user bases. In addition, the design rationale and derived functional breakdown shall account for the potential for pre-existing solutions responding in the large part to the demand, hence optimising the downstream competitive procurement processes and the reuse of well-proven and reliable solutions. 5.2.2.1.3 Breakdown The data-management functional breakdown is described here following the data elaboration logic from Sentinel-2 data acquisition at the ground-stations to data delivery the final users. The functional breakdown is depicted on Figure 5-1 and features: ○ A Data-Reception (DRX) function responsible for data acquisition from the spacecrafts and front-end data-handling activities. This function aims for a maximum reuse of existing ground-infrastructure X-Band tracking antennas (or EDRS compatible Ka- Band still antennas) and a sentinel-generic Demodulator and Front-End Processing (DFEP) equipment; ○ A Data Processing Control (DPC) function responsible for managing all data processing activities, in charge of the systematic processing of Level-0 products and higher-level production management through dedicated data-processors. It is also in charge of supervising on-line quality control activities on the performed production and for hosting user-provided processors fruit of third-party hosted-processing collaborations (Cf. sections 4.2.3 and 4.10.2.2). The DPC function aims for a rule-based data-driven management of the real-time dataflow, whilst offering additional on-demand processing capabilities as required for Data-Access. It is intended as providing most of the required parallel processing management and be highly scalable with computing hardware in this respect. ○ An Instrument Data Processing (IDP) function responsible for implementing in coordination with the DPC function the data-processing algorithms of the MSI to generate the core PDGS data-products. In addition, the user-provided processors resulting from the hosted-processing collaboration service defined in section 4.10.2.2 will be integrated as independent IDP functions. The prototype Level-2A processor will be hosted in the PDGS via this method. 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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[RD-33] Sentinel-2 MSI - Level 2A A
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LES LGS Land Equipped Sites Local G
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3.5.2 MULTI-SPECTRAL INSTRUMENT CHA
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o Report generation frequency and c
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○ MSI L1A, L1B, L1C and TCI produ
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Some relevant use cases are present
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Two main mapping services have been
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The requirement on the cloud covera
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GSC Sentinel-2 PDGS OCD - Emits - ESA

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