ALOS Data Users Handbook

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Section 3 Outline of ALOS Satellite SystemΔt=T/2 Equation 3.4-1Δt is dealt with as a fixed value.2) Time Calculation MethodCalculation of the observation time (t L ) of a line by the simple computing method is shown below.tL= t + Δt+ T / 2 + ( L −1)⋅TEquation 3.4-2nt n : Value of time tag (output from compressor)L: Line counter value (output from compressor)Where, the 3rd clause of the right-hand side of Equation 3.4-2 is a compensation clause, when theelectric charge accumulation period in Figure 3.4-18 is the same as that of the scanning cycle (T) andthe center of an electric charge accumulation period is regarded as the moment of observation.From Equations 3.4-1 and 3.4-2 t L is as follows:tL n>tL= tn−1+ Lmax(t )T (L =n −1L= t + LT (L 0)Equation 3.4-3max( t −n0)1 ): maximum value of the line counter at time tn−1c) Quick Look Data1) Gain Setting Value: 2-bit gain setting status for each band (8 bits)“00”: GAIN 4“01”: GAIN 3“10”: GAIN 2“11”: GAIN 12) Exposure Coefficient: Exposure coefficient value data of 8 bits for each band (32 bits)Exposure coefficient value data is given by Table 3.4-12. The observation time of each line of AVNIR-2is calculated from the Time Data for time greater than 1 second, and from the Line Counter for less than1 second, where one line stands for 1.48msec. The band-to-band registration or misalignment is shown inTable 3.4-11 and Figure 3.4-19. The amount of errors of each band pixel to the reference pixel is less than1 pixel in the along track and cross track directions.Table 3.4-11 Band-to-Band RegistrationItemBand-to-Band RegistrationRequirementsSetting accuracy: within ±8μmFluctuation accuracy: within ±4μm (for fluctuation on orbit)3-46
ALOS Data Users HandbookTable 3.4-12 Exposure Coefficient ValuesCommand dataExposuretimeFramecycleExposurecoefficientCommand dataExposuretimeFramecycleExposurecoefficient3-47
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ALOS Data Users HandbookSection 8 D
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ALOS Data Users Handbook8.5 Outline
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ALOS Data Users Handbook8.7.3 NOTES
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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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