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 136 of 350 radiometric and geometric corrections including ortho-rectification and spatial registration on a global reference system with sub-pixel accuracy to facilitate multi-temporal data exploitation. The MSI Level-1C product will provide Top-Of-Atmosphere (TOA) reflectance measurements with all metadata necessary to convert it in radiances. The Level-0 consolidation and Level-1 data-processing steps are based on the GPP algorithms [RD-31]. Level-0 consolidation will append all necessary metadata for Level-0 data long-term archiving and upper level processing. Level-1 processing includes the three-step processing to generate Level-1A, Level-1B and Level-1C data starting from the consolidated Level-0 data. These three levels correspond respectively to the S2MSI1A, S2MSI1B and S2MSI1C data-products baselined in section 4.4. The accommodation of the processing workflow defined for the GPP into the distributed PDGS operational context has nevertheless required a careful analysis (cf. [RD-30]) of the specific constraints imposed by the Level-1 algorithm (cf. section 4.3.9) to provide systematically and globally the products with a guaranteed timeliness and quality. This section provides an outline of the operational Level-0 consolidation and Level-1 processing approach adapted for the PDGS. After an outline description of the algorithm logic, the context of Level-1 processing in the distributed PDGS will be presented followed by the main adaptation made in accommodating the processing workflow defined for the GPP as justified by [RD-30]. 4.5.4.5.1 Level-0 Consolidation and Level-1 Processing Logic The PDGS Level-0 consolidation and Level-1 processing breakdown is based on the Sentinel-2 GPP algorithm (cf. [RD-31]). The processing workflow from instrument raw data (Instrument Source Packets, ISPs) to Level-1C data is depicted on Figure 4-23. The processing sequence is decomposed in the following steps: Level-0 Consolidation Processing o Level-0 Viewing Model Initialisation (performed within the GPP by the Init_Loc_Inv IAS). This processing step computes the viewing model for the generation of the preliminary quicklook. o Preliminary Quick-Look Processing (performed within the GPP by the Init_Loc_Inv IAS). This includes the preliminary quick-look (PQL) resampling and the computation of ancillary data for consolidated Level-0 product. o Preliminary Cloud Mask Processing (performed within the GPP by the Cloud_Inv IAS). This processing step generates the cloud mask from the preliminary quicklook based on spectral criteria. o Preliminary Quick-Look Compression (performed within the GPP by the JP2KCompression IAS). Performs the compression of the preliminary quick-look. Level-1A Processing o Level-1 Viewing Model Initialisation (performed within the GPP by the Init_Loc_Prod IAS). This processing step computes the viewing model that will be used to initialize Level-1B processing. 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.
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 137 of 350 o Decompression (performed within the GPP by the MRPBC function). This processing step performs the decompression of the ISPs inverting the on-board WICOM compression. o Level-1A Radiometric Processing (performed within the GPP by the first part of the Radio_S2 IAS). This step includes the SWIR pixels arrangement. o Level-1A Compression (performed within the GPP by the JP2KCompression IAS). This processing step compresses Level-1A imagery using JPEG2000 algorithm. Level-1B Processing o Level-1B Radiometric Processing (performed within the GPP by the second part of the Radio_S2 IAS). This includes dark signal correction, pixel response non-uniformity correction, crosstalk correction, defective pixels identification, high spatial resolution bands restoration (deconvolution and denoising) and the binning of the 60m spectral bands. o Common Geometry Grid Computation for Image-GRI Registration (performed within the GPP by the Geo_S2 IAS). This processing step defines the common monolithic geometry in which the GRI (Global Reference Images) and the reference band of the image to refine shall be resampled. o Respampling on Common Geometry Grid for Image-GRI Registration (performed within the GPP by the Geo_S2 IAS). This processing step performs the resampling on the common geometry grid for the registration between the GRI and the reference band. o Tie Points Collection for Image-GRI Registration (performed within the GPP by the Geo_S2 IAS). This processing step includes the collection of the tie points from the two images for the registration between the GRI and the reference band. o Tie Points Filtering for Image-GRI Registration (performed within the GPP by the Geo_S2 IAS). This processing step performs a filtering of the tie points over several areas (sub-scenes) and a given number of trusty tie points is required for each subscene. o Spatiotriangulation for Image-GRI Registration (performed within the GPP by the Geo_S2 IAS). This processing step refines the viewing model using the initialized viewing model and the set of ground control points from previous steps. The output refined model ensures the registration between the GRI and the reference band. o Common Geometry Grid Computation for VNIR-SWIR Registration (performed within the GPP by the Geo_S2 IAS). This processing step defines the common geometry in which the registration will be performed. The VNIR-SWIR registration processing is optional and applicability will be decided at commissioning. o Respampling on Common Geometry Grid for VNIR-SWIR Registration (performed within the GPP by the Geo_S2 IAS). This processing step performs the resampling on the common geometry grid for the registration between VNIR and SWIR bands. The VNIR-SWIR registration processing is optional and applicability will be decided at commissioning. o Tie Points Collection for VNIR-SWIR Registration (performed within the GPP by the Geo_S2 IAS). This processing step includes the collection of the tie points from the © 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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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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