MISR: In-Flight Radiometric Calibration and Characterization Plan

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spectral radiances. The second process is termed radiance conditioning. Here, the radiances areadjusted to spectrally scale the measured radiance, predicting the value measured by a nominalpassband. In addition, image sharpening is performed using PSF data. Out-of-band spectralresponse subtraction is performed on select Level 2 products.For this processing, the Level 1B1 and Level 2 processing algorithms require calibrationdata sets. Several parameters are available only through the preflight test and analysis program.Examples are the spectral calibration and point-spread function parameters. These parameters aretreated as static, as they are believed to be temporally invariant, although on-orbitcharacterizations will be done to test these assumptions.The radiometric calibration data will be updated throughout the mission. This isaccomplished through the delivery of a new ARP file. Monthly updates are planned, or as neededto maintain an accurate record of the instrument performance. The ARP also provides an estimateof radiance uncertainty (assuming a uniform scene) at several radiometric levels.The calibration data used in Level 1B1 processing are summarized in Table 3.1. Algorithmdevelopment will proceed with the preflight data. In addition to these corrections, MISR Level 2processing will remove any spectrally out-of-band contribution to the reported radiance, asdeemed necessary for that product. Calibration data used for this Level 2 correction is additionallyreported in the ARP.Table 3.1. Calibration data setsProcessingstepProcessinglevelRequired calibration dataCommentRadiancescalingLevel 1B1Radiometric gain coefficientsPreflight, updatedmonthly in-flightRadianceconditioningLevel 1B1Level 1B1Spectral in-band parametersPoint-spread functionresponsePreflight, staticPreflight, staticLevel 2(selectedproducts)Out-of-band response subtractionPreflight, static3.4.3 CharacterizationCharacterization is the measurement of the typical behavior of instrument propertieswhich may affect the accuracy or quality of the derived data products. The in-flightcharacterization includes a determination of the noise and spatial frequency response of thesensor. It determines the potential for radiometric errors as may occur for specific scene types,including those of high spatial or spectral contrast. Finally, the in-flight characterization programwill attempt to confirm that many instrument properties are as measured in the prelaunch3. Calibration overview28
laboratory environment. This includes spectral response stability, hysteresis, saturation recovery,and modulation transfer function (MTF).3.4.4 Calibration integrityCalibration integrity is the process of validating and certifying the Level 1B1 RadiometricProduct. One component of calibration integrity is determination of any radiometric biasesbetween the MISR radiometric scale, and that used by other remote sensing instrument(particularly EOS sensors). Periodic cross-comparisons with Moderate Resolution ImagingSpectroradiometer (MODIS), Système Probatoire d’Observation de la Terre (SPOT), and LandsatThematic Mapper (TM) sensor calibrations will be made, as data are made available. As an addedcheck on the radiometric calibration, there will be a routine analysis of MISR imagery over desertsites. Likewise, response stability may be verified using lunar observation data, if available.Quality assessment and traceability of the radiance scale are also tasks that will beperformed within this program.In-flight Radiometric Calibration and Characterization Plan, JPL D-1331529
Page 6: 10.4.2 Radiative transfer. . . . .
Page 9 and 10: 1. INTRODUCTION1.1 PURPOSEThis docu
Page 11 and 12: • MISR Algorithm Development Plan
Page 13 and 14: 2.1 MISR SCIENCE OBJECTIVES2. EXPER
Page 15 and 16: In addition to these modes, the ins
Page 17 and 18: Table 2.1. Level 1A productProductL
Page 19 and 20: Table 2.4. Level 1B1 Ancillary Radi
Page 21 and 22: 3. CALIBRATION OVERVIEW3.1 REQUIREM
Page 23 and 24: equally to filter pinholes or scatt
Page 25 and 26: PREFLIGHTDATAIFRCCactivityOtheracti
Page 27: Multiple methodologies are utilized
Page 31 and 32: 4. PREFLIGHT CALIBRATION AND CHARAC
Page 33 and 34: determination was originally planne
Page 35 and 36: Cause: The filters are non uniform
Page 37 and 38: is the affected area is about 30 pi
Page 39 and 40: 5. IN-FLIGHT RADIOMETRIC CALIBRATIO
Page 41 and 42: esponse functions will be verified
Page 43 and 44: the array. Dark current is expected
Page 45 and 46: OBC design effort. The actual uncer
Page 47 and 48: 5.2.1 High-altitude sensor-based ca
Page 49 and 50: laboratory measurements. In order t
Page 51 and 52: 6. LEVEL 1B1 RADIOMETRIC PRODUCT AL
Page 53 and 54: flight. Generation of the updated p
Page 55 and 56: 7. CHARACTERIZATIONThe radiance unc
Page 57 and 58: 7.1.4 PolarizationMISR has been des
Page 59 and 60: It is believed that the evaluation
Page 61 and 62: 8. CALIBRATION INTEGRITYCalibration
Page 63 and 64: The baseline CAM is the most useful
Page 65 and 66: had all lamps on, and the satellite
Page 67 and 68: 9. MANAGEMENT9.1 PERSONNEL ROLES9.1
Page 69 and 70: EurOpto (preflight radiometriccal.)
Page 71 and 72: PRINCIPALINVESTIGATORDavid J. Diner
Page 73 and 74: • Identifying/specifying all of t
Page 75 and 76: 10. REFERENCES10.1 MISR EXPERIMENT(
Page 77 and 78: 10.3 IN-FLIGHT CALIBRATION METHODOL
Page 79 and 80:
38. Vane, G., T.G. Chrien, J.H. Rei
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APPENDIX A. NOMENCLATUREThe followi
Page 83 and 84:
A.4 CHARACTERIZATIONcalibration. Th
Page 85 and 86:
G 0 , G 1 , and G 2 are the respons
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APPENDIX B. CALIBRATION MODE SEQUEN
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In Cal-Dark data are acquired over
Page 91 and 92:
Config. Home Run is a commanding of
Page 93 and 94:
Repeat for 200 line repeat times, t
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MISR: In-Flight Radiometric Calibration and Characterization Plan

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