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 156 of 350 Such calibration operations will be performed by an expert Cal/Val team 2 or 3 times per year with a processing of all data acquired over typically 1 month. For all vicarious calibration, image-acquisitions will be deterministic and pre-defined on a yearly basis. Figure 4-30 shows typical acquisitions over the Dome-C sites which can be commanded during austral summer over one 10-days repeat cycle. o Inter-band calibration through the processing of sun-glint measurements. During Phase E2, this will only be done to consolidate and monitor the calibration performed during Phase E1. This activity will be performed on a yearly basis by an expert Cal/Val team. o Refocusing of the instrument using mirror temperatures. During Phase E2, this calibration would only be performed in case of contingency and performed by an expert Cal/Val team. Given the criticality of the calibration, a robust approval procedure will be established including POM approval. o Crosstalk characterisation and correction. Sentinel-2 is designed in order not to require any crosstalk correction. In case one would be required, ground processing will account for it and the determination of the associated parameters will be performed by an expert Cal/Val team. Figure 4-30 Suitable calibration orbits over Dome-C within winter repeat-cycles 4.5.4.10.3 Level-1 Geometry Cal/Val Operations During Phase-E2, geometric calibration will mainly consist on the update of the Global Reference Image (GRI) used by to meet multi-temporal registration requirements. Calibration will be complemented with a set of activities to be only triggered in case of contingency, and a validation plan to check that user requirements are being met. 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.
GSC Sentinel-2 PDGS OCD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-TN-09-0008 page 157 of 350 4.5.4.10.3.1 Generation of the Global Reference Image A Global Reference Image will be generated to enable the extraction of Ground Control Points (GCP) used for the systematic refinement of the geometric model at the term of the Level-1B processing such as to meet multi-temporal registration requirements outlined in section 4.4.4.1. To this end, a global database of cloud-free mono-spectral Level-1B images (B4 band) corresponding to each orbit of the repeat cycle (143 orbits) will be generated as part of nominal operations starting at the commissioning phase of Sentinel-2A and fed to a specific calibration system. The global reference images will be gradually built through an appropriate selection of orbits followed by an accurate geometric refinement performed on the basis of spatio-triangulation using Sentinel-2 data and an auxiliary database of third-party images with geometric patterns and for which the geometry is mastered. This auxiliary database is currently TBD and is likely to compile geometrically calibrated images available from other missions such as SPOT. The Global Reference Image will be generated nominally once at the beginning of the Sentinel-2A mission and will be validated and accepted by a Cal/Val team. The Global Reference Image will be gradually fed-back into the PDGS processing chains as regular GIPP components. 4.5.4.10.3.2 Contingency Calibrations Geometric Cal/Val of the system will be complemented through the following contingency operations: o Correction between reference frames (steered/camera). This calibration will be performed during Phase-E2 only in case of contingency by an expert Cal/Val team. o Correction between detectors reference frames. This calibration will be done only during Phase E1 and on contingency during Phase-E2 by an expert Cal/Val team. 4.5.4.10.3.3 Validation Geometric performances validation will be performed on a yearly basis by an expert Cal/Val team, including: o Geolocation accuracy assessment using reference sites with geometric patterns and for which geometry is mastered. o Multi-temporal registration assessment using image correlation techniques. o Multi-spectral registration assessment using correlation between images of different bands. 4.5.4.10.4 Level-2 Cal/Val Operations For Level-2 data, Cal/Val operations are divided between cloud-screening and atmospheric - correction components. 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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Product- Type On-Line retention Off
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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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