ALOS Data Users Handbook

ALOS Data Users HandbookMain characteristics of AVNIR-2 is shown in Table 3.2-5 and the main operation modes are given by Table 3.2-6.Table 3.2-5 AVNIR-2 Main CharacteristicsItem Specification RemarksObservation wavelength ch 1: 0.42 – 0.50 µmch 2: 0.52 – 0.60 µmch 3: 0.61 – 0.69 µmch 4: 0.76 – 0.89 µmSpatial resolution (IFOV)10m (Approx. 14.28 µrad)Spatial frequency transmission ch 1-3: 0.25, ch 4: 0.20characteristicsObservation width> 70 km (Approx. 5.8 degree)Number of detectors7100 / bandScan cycle1.48 millisecondMTF Band 1 – 3 : > 0.25Band 4 : > 0.20(At the Nyquist frequency)Gain4 stepsS/N > 200 Settable per bandRegistration accuracy between bands Setting accuracy within ± 8 µmVariation element within ± 4 µm(on the orbit)Pointing angle± 44 degreePointing setting step angle 0.01875 degree/pulse At light axisPointing angle setting accuracy Within 0.05 degreePointing angle reading accuracy Within 0.05 degreeEncoder unit0.044 degree (light axis)AD bit8 bit / pixelData rate 160 Mbps (40 Mbps/band) Before compressionTable 3.2-6 AVNIR-2 Operation ModesMode Content RemarksObservation ObservationStandbySet and keep a condition to transit into observationmode or calibration modes1 Calibration using internal lamp ACalibration 2 Calibration using internal lamp B3 Calibration using both internal lamps A and B Option3-13