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 256 of 350 Thus the buffer of unprocessed data product is foreseen to be always under a predefined threshold in order to meet the timeliness requirement and to assure the completeness of the process. The IDP operations are systematically triggered through the DPC function supervision in charge of the overall handling of the input data-flow to the IDP instances and the generated outputs gathering. As such, IDP operation concepts are systematically managed through the DPC. 6.3.2 OPERATION CONSTRAINTS The following operation constraints are identified for the IDP function: ‣ Commanding & Control by the DPC function: the IDP function execution is managed through the DPC function interface and will comply with its interface requirements; ‣ As hosted on the DPC environment, it will have a tight coupling and inherit constraints linked to the processing environment (I/O, hardware platform, etc); ‣ Support to processing parallelisation: the IDP functional tasks must be decomposed into concrete processing steps maximising the opportunities for parallelisation and optimisation of the available HW resources (i.e. memory, CPUs, I/O). Accordingly the DPC function will be able to orchestrate simultaneously several IDP tasks (of different or same type) according to the inputs, configuration and available resources. 6.3.3 OPERATION SCENARIOS 6.3.3.1 Instrument Data Processing Configuration This scenario stands for the operator-driven configuration activities of the processing activities prior to its activation and normal operations. This scenario also accounts for the operatordriven definition and configuration of the DPC and the IDP (cf. section 6.3) functions and can be assumed to be performed jointly with the one defined in section 6.2.3.1 - Data Processing Control Configuration. Accordingly to the DPC function operation scenario, the operator is supported by the RP function in the process of the definition of the IDP configuration to test and rehearsal the processing activities devoted to the fine tuning configuration (cf. section 6.18.3.4 - Mission Configuration Validation). The use case of this scenario is the generation of the PDGS processing configuration (i.e. DPC/IDP functions). Such configuration is modelled to take into account the different data product load assigned to the different processing centres and can be managed by the MCC function (cf. section 6.14 - Mission Configuration Control (MCC) Operations) as Mission Reference Files for their release across the federated centres. 6.3.3.2 IDP Data Processing This scenario accounts for the autonomous data processing activities performed by the IDP function according to the processing directives provided by the DPC function. © 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 257 of 350 The PDGS/IDP function execution is managed by the PDGS/DPC function (cf. section 6.2), performing the commanding & control of the processing activities (i.e. triggering the function execution, trap its result, inputs/outputs management, etc). Accordingly, the IDP function once triggered by the DPC function performs autonomously the required processing activities according to the supplied processing directives without any operator intervention. The following steps are identified for this operation scenario: 1) The IDP function is invoked by the DPC function and provides the processing activities directive (i.e. a job-order file); 2) The IDP function autonomously processes the provided processing directive to identify the requested processing activity, inputs location, desired outputs, etc; 3) The IDP function autonomously processes (parsing, verification, loading into memory, etc) the input data (e.g. MSI data, auxiliary data, ancillary data, configuration); 4) The IDP function autonomously invokes required processing modules with the gathered and decoded input data to generate the requested PDIs according to received processing directive; 5) The IDP function deposits the generated PDIs to the DPC function interface according to the provided processing directive; 6) The IDP function can autonomously generate a processing report which summarizes the performed processing activities; 7) The IDP function exists notifying to the DPC function with a summary the result of the processing activities performed (i.e. success, failure, partially completed, etc.). All the IDP function data processing activities are performed autonomously without any operator intervention. In case of a contingency (e.g. failure process), the operator will be able to interactively submit on request the same processing directive and trigger the IDP function processing through the DPC function (cf. section 6.2). The use cases of this scenario are the different processing activities performed in the PDGS. The MSI L1A, L1B, L1C PDIs generation. The DPC function provides required L0 data granules and chain the upper levels processing activities by commanding the IDP function. True colour images generation. The DPC function based on the MSI generated data manages the true colour image processor generation. Collaborative hosted processors are considered part of the IDP function perimeter and managed as such. In particular, the MSI L2A prototype processor will be acting as a separate IDP function triggered interactively through the hosted-processing service interface. 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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Table 4-5 Radiometric image quality
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Two main mapping services have been
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GSC Sentinel-2 PDGS OCD - Emits - ESA

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