GSC Sentinel-2 PDGS OCD - Emits - ESA

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GSC Sentinel-2 PDGS OCD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-TN-09-0008 page 100 of 350 Product- Type Identifier Basic Product Subscriptions Seasonal Subscriptions S2MSI0 √ N/A Optimised Cloud-Free Subscriptions N/A S2MSI1A √ √ S2MSI1B √ √ S2MSI1C √ √ √ Table 4-4 Sentinel-2 Data-Set Subscriptions per product-type 4.4.4 PRODUCT QUALITY User needs in terms of product quality derive from a set of requirements expressed in Sentinel-2 MRD [AD-01]. In order to meet these data quality standards and to ensure data integrity, the measurement system (including both space and ground sub-systems) shall be calibrated and the resulting products submitted to a Quality Control (QC). The following paragraphs present the main quality requirements applicable to the Level-1C (S2MSI1C) and prototype Level-2A (S2MSI2Ap) products. To meet the defined quality requirements, the Calibration and Validation (Cal/Val) plan defined in section 4.5.4.10 will systematically be applied. In complement, the operational monitoring of the resulting product-quality will be ensured through well-defined QC procedures. Products will be annotated with Quality Indicators (QI), which provide to the user the required information to assess the suitability of the data for a particular use/application. The Sentinel-2 Product Definition Document [RD-07] details the QI concept and provides a complete list of the QIs provided with each product. 4.4.4.1 Level-1C Quality Baseline Concerning the radiometry requirements, Table 3-2 shows the spectral bands characteristics and the required Signal-to-Noise Ratio (SNR) for the reference radiances (L ref ) defined for the mission. Other radiometric image quality requirements are presented in Table 4-5. Radiometric image quality requirement Performance Absolute calibration knowledge accuracy 3 % (goal) , 5 % (threshold) Cross-band calibration knowledge accuracy 3 % Multi-temporal calibration knowledge accuracy 1 % Linearity knowledge accuracy 1 % Modulation Tranfer Function (MTF) 10m bands: between 0.15 and 0.3 20m and 60m bands: below 0.45 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.
Table 4-5 Radiometric image quality requirements. GSC Sentinel-2 PDGS OCD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-TN-09-0008 page 101 of 350 Geometric image quality requirement Performance Ground processing hypothesis A priori accuracy of image location 2km max (3) No processing Accuracy of image location Accuracy of image location Multitemporal registration Multispectral registration for any couple of spectral bands 20m (2) After image processing without control points 12.5m (2) After image processing with control points 3m (2) for 10m bands 6m (2) for 20m bands 18m (2) for 60m bands 3m (3) for 10m bands 6m (3) for 20m bands 18m (3) for 60m bands Table 4-6 Geometric image quality requirements. 4.4.4.2 Prototype Level-2A Quality Baseline After image processing with control points After image processing with control points Prototype Level-2A products are those related to the correction of the atmospheric and topography influences in order to derive radiometric measurements at surface level. The target accuracy for the bottom-of-atmosphere (BOA) reflectance is 5% relative. For water vapour a relative accuracy of 10% is aimed for in the range between 0.1 and 4 g/cm 2 . The target aerosol optical depth (AOD) accuracy is 10% relative for the range between 0.05 and 3. Being a prototype product, the above quality levels will be monitored and fine-tuned during the mission lifetime. 4.4.5 PRODUCT TIMELINESS The product characteristics in terms of timeliness will be settled in the HLOP based on the choice of the CGS network and priority rules. As such, they will directly cascade from the high-level mission operation principles outlined in section 4.5.1.5 on this matter and further detailed in section 4.5.4.2. According to the above, product timeliness will be observed as falling into three classes with their association with GSCDA timeliness denominations defined in [AD-02]: ○ Real-Time (RT), corresponding to the product on-line availability no later than 100 minutes after data sensing. As all data will be processed “on-the-flow” from datareception it is anticipated that a large part of RT products will match the NRT1h timeliness denomination of the GSCDA; 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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4.6.3 OPERATIONAL TRANSFER BASELINE
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Product- Type Identifier S2MSI0 S2M
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5 PDGS DESIGN GSC Sentinel-2 PDGS O
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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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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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