ALOS Data Users Handbook

Section 7 Overview of Processing Algorithms7.3 PALSAR7.3.1 Outline of PALSAR Level 1.0 Processing AlgorithmIn the PALSAR Level 1.0 processing, Level 1.0 data is generated from Level 0 data. Level 1.0 processingconsists of pre-processing, CCSDS processing, PALSAR unpacking processing, PALSAR data splitprocessing and CEOS format generation processing as shown in Figure 7.3-1.Work orderPre-processingLevel 0 dataPrecision position dataAttitude dataCCSDS processingPALSAR unpackingprocessingResult ofprimary checkPALSAR data splitprocessingCEOS formatgenerationLevel 1.0dataFigure 7.3-1 PALSAR Level 1.0 Processing Flow7.3.1.1 Pre-processingPre-processing is executed before all processing tasks. The size of one scene is defined as ± 8.2 second fromthe scene center time instructed by the work order (± 28.5 second in the ScanSAR mode). In the ScanSARmode, an extraction point is defined as the border of each burst in order to avoid starting the extraction beforeone burst is completed. The data is started from the beginning of the next burst in the starting side and isended at the end of the given burst.7.3.1.2 CCSDS ProcessingCCSDS Processing is as follows;7-22