GSC Sentinel-2 PDGS STBD - emits - ESA

GSC Sentinel-2 PDGS STBDIssue 1 Revision 2 (draft) - 25.07.2010GMES-GSEG-EOPG-TN-09-0031page 26 of 603.3.2.1.7 Preliminary Cloud Mask Processing: Parallelization by Detector and Along-TrackFragmentPreliminary Cloud Mask Processing is performed within the GPP algorithm by the Cloud_InvIAS.This processing step can be parallelised by detector and along-track fragments of image.3.3.2.1.8 PQL Compression: Parallelization by Along-Track FragmentPQL Compression is performed within the GPP algorithm by the JP2KCompression IAS.This processing step can be parallelised by Along-Track Fragment.3.3.2.2 Level-1 Processing3.3.2.2.1 Level-1 Viewing Model Initialisation: Parallelization by Band and DetectorLevel-1 Viewing Model Initialisation is performed within the GPP algorithm by theInit_Loc_Prod IAS.This processing step can be parallelised by band and by detector.3.3.2.2.2 Decompression: Parallelization by Detector Band and Along-Track FragmentThe decompression software (implemented by the MRCPBG CFI) can only uncompress Nsource packets (image piece of Nx16 lines) from a larger file composed of M sourcepackets. This can be considered a sort of inner parallelisation and the decompression musthave access in that case to the whole information as input.The parameters M and N must be given in the command line of the MRCPBG tool (or via theconfiguration file)DecompressioImagesproducedDecompressioDecompressioFigure 9 : Parallelization example on 3 filesESA 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.