GSC Sentinel-2 PDGS STBD - emits - ESA
GSC Sentinel-2 PDGS STBD - emits - ESA GSC Sentinel-2 PDGS STBD - emits - ESA
GSC Sentinel-2 PDGS STBDIssue 1 Revision 2 (draft) - 25.07.2010GMES-GSEG-EOPG-TN-09-0031page 27 of 60Otherwise it is also possible to « split » the input file allowing an outer parallelisation.In that case, the input data splitting shall be performed considering the necessary margins,i.e. ensuring an overlap of 4 sources packets between the input files in order to perform acorrect wavelet transform without artefacts:DecompressionImageproduced4 BDLSplitted in 3filesDecompression4 BDLDecompressionFigure 10 : Parallelization example on 3 files, splitting input file3.3.2.2.3 Level-1A Radiometric Processing: Parallelisation by Detector and Along-TrackFragmentLevel-1A Radiometric Processing is performed within the GPP algorithm by the first part ofthe Radio_S2 IAS. This includes the SWIR pixels arrangement that can be parallelised byDetector and along-track fragments. Only SWIR bands undergo this processing. See §4.2.3.5.3.3.2.2.4 Level-1A Compression: Parallelisation by Detector and Along-Track FragmentSee § 4.2.2.8. In addition there’s also the possibility of parallelising by detector.3.3.2.2.5 Level-1B Radiometric Processing: Parallelisation by Detector and Along-TrackFragmentLevel-1B Radiometric Processing (performed within the GPP algorithm by the second part ofthe Radio_S2 IAS). This includes image deconvolution, denoising, crosstalk correction, etc.It shall be possible to parallelize RADIO_S2 processing by Detector and along-trackfragments. In that case, the RADIO_S2 is responsible for producing a « perfect » extract oneach required fragment. To do so, adequate margins shall be provided in the input data toavoid side effects (eg. deconvolution margins, denoising margins).The following figure represents the possible processing parallelisation of an image detector.ESA UNCLASSIFIED – For Official Use© ESAThe copyright of this document is the property of ESA. It is supplied in confidence and shall not be reproduced, copied orcommunicated to any third party without written permission from ESA.
GSC Sentinel-2 PDGS STBDIssue 1 Revision 2 (draft) - 25.07.2010GMES-GSEG-EOPG-TN-09-0031page 28 of 60Note that due to crosstalk corrections, it may be impossible to decouple correction of oneband from another. It is why all bands for a given detector shall be accessible as input.ImageImageDetectorDetector iiAll bands for agiven detectorRun #1« RADIO_S2 »Run #2« RADIO_S2 »Run #N« RADIO_S2 »Resulting Fragment # N(Fragment fullyprocessed)Resulting Fragment # 2(Fragment fullyprocessed)Resulting Fragment # 1(Fragment fullyprocessed)Following stepsFigure 11: Example of parallelisation on N executions : N fragments are obtained3.3.2.2.6 Common Geometry Grid Computation: Parallelisation by Band and DetectorCommon Geometry Grid Computation is performed within the GPP algorithm by Phases 1 to6 of the Geo_S2 IAS.This processing step can be parallelised by band and by detector. The limit of parallelisationis then 24 because only 2 bands are processed (reference band and reference image).3.3.2.2.7 Resampling on Common Geometry Grid: Parallelization by Band and Bloc ofTarget ImageResampling on Common Geometry Grid is performed within the GPP algorithm by Phases 7to 8 of the Geo_S2 IAS.This processing step can be parallelised by band and by bloc of target image.ESA UNCLASSIFIED – For Official Use© ESAThe copyright of this document is the property of ESA. It is supplied in confidence and shall not be reproduced, copied orcommunicated to any third party without written permission from ESA.
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<strong>GSC</strong> <strong>Sentinel</strong>-2 <strong>PDGS</strong> <strong>STBD</strong>Issue 1 Revision 2 (draft) - 25.07.2010GMES-GSEG-EOPG-TN-09-0031page 28 of 60Note that due to crosstalk corrections, it may be impossible to decouple correction of oneband from another. It is why all bands for a given detector shall be accessible as input.ImageImageDetectorDetector iiAll bands for agiven detectorRun #1« RADIO_S2 »Run #2« RADIO_S2 »Run #N« RADIO_S2 »Resulting Fragment # N(Fragment fullyprocessed)Resulting Fragment # 2(Fragment fullyprocessed)Resulting Fragment # 1(Fragment fullyprocessed)Following stepsFigure 11: Example of parallelisation on N executions : N fragments are obtained3.3.2.2.6 Common Geometry Grid Computation: Parallelisation by Band and DetectorCommon Geometry Grid Computation is performed within the GPP algorithm by Phases 1 to6 of the Geo_S2 IAS.This processing step can be parallelised by band and by detector. The limit of parallelisationis then 24 because only 2 bands are processed (reference band and reference image).3.3.2.2.7 Resampling on Common Geometry Grid: Parallelization by Band and Bloc ofTarget ImageResampling on Common Geometry Grid is performed within the GPP algorithm by Phases 7to 8 of the Geo_S2 IAS.This processing step can be parallelised by band and by bloc of target image.<strong>ESA</strong> UNCLASSIFIED – For Official Use© <strong>ESA</strong>The copyright of this document is the property of <strong>ESA</strong>. It is supplied in confidence and shall not be reproduced, copied orcommunicated to any third party without written permission from <strong>ESA</strong>.
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