ALOS Data Users Handbook

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Section 6 ALOS Data Products6.3.3 Pixel SpacingTable 6.3-4 shows the pixel spacing of level 1.5 products for each observational mode.Table 6.3-4 Pixel Spacing of Level 1.5 ProductsProcessingLevel1.5Fine modeScanSAR modeDirectDownlinkmodePolarimetrymodeSingle DualBurst mode 1 Burst mode 2polarization polarization6.25m(2look)12.5m(4look) 100m 100m 12.5m(4look) 12.5m(4look)12.5m(4look)6.3.4 Products SizeThe definitions of the scene size are summarized in Table 6.3-5, the image frame sizes of level 1.5 are shownin Table 6.3-6. And shows sample numbers for each observational mode, off-nadir angle and others.ProcessingScene SizelevelRange direction1.0 Input signal data length[corresponds to signal gate width]1.1 Valid signal data length[corresponds to signal gate width -pulse width]Table 6.3-5 Definitions of Scene SizeScene SizeAzimuth directionThe size corresponds to the followinglength (includes synthetic aperture length)- Except ScanSAR mode:16.4 sec (corresponding to 110km)- ScanSAR mode:57.0 sec (corresponding to 385km)Fine/Direct Downlink modes: 51 to 79 kmPolarimetry mode: 62 to 83kmRemarksIn the case ofScanSAR mode,data is extracted atburst boundariesExcept ScanSARmodeRemark: For level 1.0, the number of records and the record length are fixed according to observationalmodes and off-nadir angles.Table 6.3-6 Image Sizes of Level 1.5 DataObservation modeImage Size Image SizeRange direction Azimuth directionoff-nadir angle 9.9 deg. - 43.4 deg. 70 kmFine/Directoff-nadir angle 45.2 deg. - 50.0 deg. 50 kmDownlink modesoff-nadir angle 50.8 deg.40 kmRemarkPolarimetry mode off-nadir angle 9.7 deg. - 26.2 deg. Remark Remark5 scan 350 kmScanSAR mode 4 scan 300 km350 km3 scan 250 kmRemark: Image size of azimuth direction is variable according to PRF and off-nadir angle.Fine mode and Direct Downlink mode: 51 – 79 km (Azimuth direction)Polarimetry mode: 20 – 65 km (Range direction), 62 – 83 km (Azimuth direction)6-12
ALOS Data Users Handbook6.3.5 Processing ParametersTable 6.3-7 Summary of Processing ParametersItemsProcessing level1.0 1.1 1.5Map projection - - UTM, PS, MER, LCC(*3)Framing (*1) - - GR, GCImage direction (*2) - - MapResampling - - NN,BL,CCGeodetic coordinate(Earth model)- - ITRF97(GRS80)Scene Shift -5 to 4 -5 to 4 -5 to 4Window Function - rectangle rectangleMulti-look Number - 1 depending on observation modePixel Spacing - -depending on observation modeand multi-look number(*1) GR: Georeference, GC: Geocoded(*2) Valid in the case of Geo-coded(*3) UTM, PS, MER or LCC can be chosen in the case of ScanSAR mode and UTM or PScan be chosen in other cases.6.3.6 Product FormatsPALSAR product formats are based on the CEOS (Committee on Earth Observation Satellites) SAR dataformat with some modification.PALSAR level 1.0 data is consists of one Volume Directory File, one SAR Leader File, some SAR Data Filesand one SAR Trailer File as shown in Figure 6.3-1. SAR Data File is divided for each polarization in case ofdual polarization in high resolution mode or polarimetry mode. On the other hand, it is not divided for eachscan in case of ScanSAR mode. The order of image data is BSQ format.Table 6.3-8 shows the contents of PALSAR level 1.0 product files for each operation mode.6-13
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ALOS Data Users HandbookSection 1 I
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APPENDIXALOS Data Users Handbook
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Appendix 1 Acronyms and Abbreviatio
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ALOS Data Users HandbookAppendix 2
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ALOS Data Users Handbook

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