ALOS Data Users Handbook

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Section 6 ALOS Data Products6.2.4 Production TypesTable 6.2-3 describes the products of AVNIR-2.Table 6.2-3 AVNIR-2 Data ProductsLevelScene The number ofSpecification files/ ContentsUnitSize1A RSP (Path, frame) 8/B1 to B4 Geo-reference 1*7100*8000*4 = 217M1B1 + Shift (Frame No.) 8/B1 to B4 Geo-reference 1*7100*8000*4 = 217M1B2R (D) 7/B1 to B4 Geo-reference 1*7100*7000*4= 190M (Standard)max.: about 450MPixel spacing 10-15-20m: max1*8876*7000*4 = 273MPixel spacing 10m (Fixed): max1*16679*7000*4 = 445.4M1B2G (D)7/B1 to B4 Geo-coded VariableTwice as large as Geo-reference at the maximum = 891M* size = (byte) x (pixel) x (line) x (band)6.2.5 Product FormatAVNIR-2 products are in CEOS format (BSQ). AVNIR-2 product is composed of five different files asshown below, and each file consists of multiple records.In the geometrically uncorrected image of AVNIR-2, image file is not separated into odd number pixels andeven number pixels, and simple correction for stagger-linear between odd and even number pixel is notperformed. That is, the data on the same line consist of the same observation time.Volume DirectoryVolume DirectoryLeaderLeaderBand 1 Band 1ImageBand 2 Band 2ImageBand 3 Band 3Band 4Band 4TrailerTrailerSupplementalAVNIR-2 Level 1A, 1B1AVNIR-2 Level 1B2Figure 6.2-1 File Structure of AVNIR-2 Products6-10
ALOS Data Users Handbook6.3 PALSAR Data Products 46.3.1 Definition of PALSAR Processing LevelStandard processing levels of PALSAR are shown in Table 6.3-1.Table 6.3-1 Level Definition of PALSAR Standard Data ProductsLevel Definition Option Note1.0 Reconstructed, unprocessed signal data appended withradiometric and geometric correction coefficientsSeparate image files for eachpolarization (HH, VV, HV, VH)(appended but not applied)1.1 Range and azimuth compressedSeparate image files for eachComplex data on slant range1.5 Multi-look processed image projected to map coordinates.Latitudes and longitudes in the product are calculatedwithout considering the altitude.[Option] G: Systematically Geo-codedR: Systematically Geo-referencedOption G or R is alternativeMap projectionResamplingPixel spacingpolarization (HH, VV, HV, VH)Only either of options G and Ris selectable.Separate image files for eachpolarization (HH, VV, HV, VH)Table 6.3-2 Processing Levels of Observational ModesObservation ModeProcessing Level1.0 1.1 1.5RemarksFine modeSingle polarization O O O 18 beamsDual polarization O O O 18 beamsScanSAR modeBurst mode 1 O - O 3 scans, 4 scans, 5 scansBurst mode 2 O - O 3 scans, 4 scans, 5 scansDirect Downlink mode O O O 18 beamsPolarimetry mode O O O 12 beamsRemark: Level 1.0 data sometimes includes calibration data as well as observation data.6.3.2 Processing Level and Data TypeThe data type for each processing level is shown in Table 6.3-3.Table 6.3-3 Processing Levels and Their Data TypesProcessingDataDATA Formats Data coordinatelevelmeaningsRemarks1.0 8 bit(I) + 8 bit(Q) - -1.1 32 bit(I) + 32 bit(Q) (*1) Slant range coordinate - Except ScanSAR mode1.5 16 bit unsigned integer (*2) Map coodinate Amplitude(*1) I and Q are real data based on IEEE. Byte order is Big Endian.(*2) Byte order is Big Endian4 Refer to “ALOS PALSAR Level 1 Product Format Description (Vol.1: Level 1.0)” and “ALOS PALSAR Level 1Product Format Description (Vol.2: Level 1.1/1.5)” (http://www.eorc.jaxa.jp/ALOS/doc/format.htm) for details.6-11
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APPENDIXALOS Data Users Handbook
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Appendix 1 Acronyms and Abbreviatio
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