ALOS Data Users Handbook

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Section 7 Overview of Processing AlgorithmsSceneframingTimesystemjudgmentLinegenerationPre-processingOrbit dataTime error info.Level 0 dataQualityinformationOrbit dataOrbit dataSystem telemetryTime of thescene centerAUX dataAttitude dataQuaternionTime of thescene centerResult of timesystem judgmentCCD (band)different imageTelemetry dataResult ofpreliminarycheckCoordinatetransformationinfo.TelemetryengineeringvalueTime of thescene centerResult of timesystem judgmentProductProductgenerationCloudcoverageinformationProduct storinginformationCorrected imagedata (product)DistortioncorrectionRadiometriccorrection info.Geometriccorrection info.Generatingradiometric correctioninformationGeneratinggeometric correctioninformationConstant forcalculating radiometriccorrection coefficientConstant forcalculating geometriccorrection coefficientSummary info.Orbit dataWork reportQuaternionFigure 7.2-1 Proccessing Flow for Optical Sensor7-10
ALOS Data Users Handbook7.2.2 Radiometrically Corrected Processing7.2.2.1 PRISM(1) Block diagramFigure 7.2-2 shows the elements of the radiometric model.Optics & DetectorAnalog Signal ProcessorOpticsCCD1.Preamp1-1Preamp1-2.ASP 1-1ASP 1-2.CCD8Preamp8-1Preamp8-2ASP 8-1ASP 8-2Figure 7.2-2 Block Diagram of the Radiometric Model(2) Basic EquationA basic equation expressing the relation between the radiance for observation and the sensor output isdescribed as follows.O = A×L + B Equation 7.2-1O: Sensor output [DN]L: Radiance for observation (Luminance) [w/m2/sr/μm]A: Sensitivity [/(w/m 2 /sr/µm)]B: OffsetAccording to the above relation, the basic equation for the processing of sensor output is as follows.L= (O- B) / A Equation 7.2-2(3) Radiometric Model EquationO( g,i,n,k,TCCD,TASP) =A( g,i,n,k,TCCD0 ( i ),TASP0( i )) × DCCD( i,n,k,TCCD( i )) × DASP(g,i,n, j,TASP( i )) × L Equation 7.2-3+ OB( g,i,n, j ) + B( g,i,n, j ) + ΔB(g,i,n,k )Where, each element in the above equation is described in Table 7.2-1. The required parameters for the7-11
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ALOS Data Users HandbookSection 1 I
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