GSC Sentinel-2 PDGS OCD - Emits - ESA

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6.4 On-line Quality Control (OLQC) Operations 6.4.1 PRINCIPLES 6.4.1.1 Systematic Quality Control Concept 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 258 of 350 Systematic quality control consists in performing essential quality checks on all MSI data generated by the PDGS in an entirely autonomous manner (operator unattended). The checks include basic consistency verification of the format and value ranges, and more complex and specific control algorithms over the quality indicators associated to the radiometry and geometry properties of the images (e.g. histograms statistics, GCP residuals, etc). The result of the systematic quality-control activity is the annotation of Quality Indicators (QI) that will be embedded in the product metadata for: ○ Monitoring and investigation purposes; ○ Overall traceability under the form of one or several “quality-reports” linked to the product. In addition specific expert QIs will be computed for short to long term monitoring purposes through the PDGS/MPA complementary function. 6.4.1.2 Quality Indicators (QI) Generation & Usage Depending on the product level, several on-line quality indicators have been identified. Examples of envisaged on-line quality check are described in [RD-07]. Most of them can directly be derived from the product quality indicators generated by the PDGS/IDP function during the products processing; others are derived by the OLQC function through simple operations on the product. Every QI generated by the OLQC function will be appended to the relevant data products. Most QIs will be used for off-line (i.e. not real time) monitoring activities (by the Off-line Quality Control sub-function of the MPA) in order to control products performance and accuracy trends, as well as to extrapolate instrument performances. 6.4.1.3 Quality Indicators (QI) Scope The OLQC function quality checks are autonomously applied on the MSI product data and metadata according to the logic breakdown as defined in the Sentinel-2 Product Definition Document (cf. [RD-07]) and the physical layout modelled for the archiving purposes (i.e. the product data items – PDIs). Accordingly the OLQC operations are performed at different levels according to the production breakdown: PDI-level: this is the general case of processing the product data and metadata in order to retrieve and verify the quality information detected/contained at single PDI © 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 259 of 350 level. This means that every PDI will be processed separately and the respective QI will be associated to it; Group of PDIs: some QI checks need more than one PDI (e.g. the set of image granules/tiles within a datastrip) and for this reason OLQC operations are envisaged to be applied to a group of PDIs. Furthermore, according to the Sentinel-2 Product Definition Document, if some granule/tile level QIs are common or shareable with others (i.e. at datastrip or orbit level) they will be stored as a single and common QI associated to the appropriate set of PDIs. 6.4.2 OPERATION CONSTRAINTS The OLQC function shall be fully automatic. Overall, it shall run within very limited time and resources such as not to take more than 1% of the overall DPC processing budget. 6.4.3 OPERATION SCENARIOS 6.4.3.1 Definition & Configuration of the Quality Control Checks This scenario accounts for the operator-driven definition and configuration of the OLQC function by the specification of the quality controls to be performed to the PDGS generated production. The OLQC function can be supported by the DPC function with respect to the commanding and control of the test and rehearsal quality control activities devoted to the fine tuning configuration. The following steps are identified for this operation scenario: 1) The MPAC expert team defines the applicable quality control thresholds to be performed on the PDGS production (checks on the quality indicators); 2) Accordingly the MPAC expert team supplies the OLQC configuration to the MCC function for distribution across the PDGS processing centres; 3) The processing-centre operator undertakes the OLQC configuration and activates it. The use case of this operation scenario is the definition of the quality control checks that the OLQC function will apply. Such definition is done in the PDGS MPAC and then distributed to all the PDGS centres with data processing capabilities (e.g. the CGSs, PACs). 6.4.3.2 Systematic Quality Control Checks This scenario accounts for the OLQC function autonomous quality control activities systematically performed on generated MSI products. The OLQC function will autonomously perform the QI computation for being appended as auxiliary data/metadata and the verification of the configured thresholds specified in the previous operation scenario. The following steps are identified for this operation scenario: 1) The OLQC function is invoked by the DPC function for quality control activities on the new production just generated by IDP function; 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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GSC Sentinel-2 PDGS OCD - Emits - ESA

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