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 208 of 350 ○ The DRX function aims for a maximum reuse of existing ground-infrastructure X-Band tracking antennas or EDRS compatible Ka-Band still antennas; ○ Demodulation and front-end processing activities are aimed for reuse of a sentinelgeneric DFEP equipment; ○ DFEP activities are aimed for systematic operation with hot-redundant capability on separate hardware; ○ The CGS operations aim for sharing the DFEP capabilities between several GMES Sentinel missions though a single equipment if their respective acquisition plans allow for it. ○ Sentinel-2 data downlink characteristics feature a high data-throughput of twice 280Mbps parallel real-time data-rate requiring equal or higher throughput capability on the DRX equipment at least from data acquisition to local DFEP storage; ○ The DCP function shall not be constrained to process the DRX input stream at 560Mbps data-rate; ○ A Sentinel-2 data-reception pass may include the independent streamed downlinks of MSI data, spacecraft HKTM data and Ancillary data; ○ DRX operations aim at 99% reliability in average from antenna acquisition down to nominal or contingency data supply to the DPC function, even if the DFEP equipment is shared synchronously among GMES Sentinel missions; ○ Potential antenna operation conflicts between Sentinel spacecrafts may impose switching between a nominal and a backup antenna; 5.2.3.1.3 Function Interfaces The following function interfaces are identified for the DRX: ○ The external X-Band or Ka-Band RF signal interface from Sentrinel-2 or EDRS spacecrafts; ○ The data-supply interface vis-à-vis the DPC function (e.g. via network); ○ An FTP/SFTP server interface for remote access to the local-store; ○ A data-reception commanding and configuration interface from the MPL function via the MCC and DC functions; ○ A reporting interface to the MCC function via the DC function; ○ An M&C interface for status monitoring. 5.2.3.2 Data Processing Control (DPC) Function 5.2.3.2.1 Function Objectives and High-Level Description The DPC function is responsible for coordination & orchestration of data processing and archiving activities according to defined processing rules. As such the DPC function manages and fragments inputs data (i.e. MSI input data for higher level product generation) and then coordinates required processing activities to be performed according to mission timeliness. In © 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 209 of 350 addition DPC coordinates archive activities of generated outputs to chain new processing activities according to the configuration processing rules. As such, it is in charge of: ○ Supporting the generation of Sentinel-2 products including post-processing QC algorithms within applicable timeliness constraints; ○ Level-0 products generation through a specific interface with DRX function to process received ISP data; ○ Supporting “on-the-flow” processing as input data become available managing required processing activities; ○ Fragmenting input data flow in processing data-trunks (e.g. L0 data fragmentation per detector and on-board scene) according to the processing parallelisation strategy to support simultaneous processing activities; ○ Managing simultaneous processing activities of MSI data fragments for product generation activities; ○ Managing simultaneous QC post-processing activities on generated data fragments; ○ Interfacing with archive for required inputs retrieval (MSI data fragments and related ancillary & auxiliary data) and new generated MSI data fragments storage; ○ Integrating user-provided hosted-processors (e.g. L2 or L3 processors) following a TBD ICD; ○ Supporting user requests for hosted-processing activities triggered by the DAG function; ○ Supporting operator-driven bulk-data re-processing activities (i.e. to perform reprocessing campaigns); ○ Supporting configurable processing and quality-control activities chaining with adaptive priorities management (e.g. NRT, nominal, re-processing, etc.); 5.2.3.2.2 Design Drivers and Constraints The following drivers and constraints are identified: ○ Strong input data flow fragmentation in data-trunks (i.e. processing units) needed for the parallelization strategy; ○ Near-linear processing scalability achieved via input-data fragmentation & management of simultaneous processing activities; ○ Processing resources scalability (i.e. possibility to enhance processing capabilities by swift new HW addition); ○ High performance interface between DPC function managed processing nodes and archive & inventory function for required I/O storage and retrieval; ○ High performance interface with DRX function for level-0 processing activities; ○ Well-defined processing interface supporting swift third-party processor integration (QC, TCI, coverage-report, user-processors); © 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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Table 4-5 Radiometric image quality
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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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