MISR: In-Flight Radiometric Calibration and Characterization Plan

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These are the limits in radiance about the radiance estimated from the calibrationregression, or the fidelity intervalsSensor output digital countsDNDN u (L l )DN l (L u )L lL uLKnown radiometric input (W m -2 sr- 1 µm -1 )Radiometric transfer curvetraceability. The property of a result of a measurement whereby it can be related toappropriate standards, generally international or national standards, through an unbroken chain ofcomparisons.verification. Tests and analyses to be performed during the design, development,assembly, and integration phases of an instrument to assure all instrument functional requirementshave been met. Includes all sub-system and system tests done at the functional level. Seeintegrator verification tests.A.4.1 Radiometricresponse coefficients. The coefficients of the radiometric calibration equation used torelate sensor output to incident radiance.calibration equation. During radiometric calibration the relationship between anincident radiance field and camera digital output is established. The equation MISR will use is:2DN – DN o = G o + G 1 L λ + G 2L λ .whereL λ is the incident band-averaged spectral radiance, averaged over both in-and-out-of-bandwavelengths, reported in units of [W m -2 sr- 1 µm -1 ], and defined by the equation:L λ∫L source Rλdλ= ----------------------------------Rλdλ∫DN is the camera output digital number,and R is the relative instrument spectral response;84Appendix A. Nomenclature
G 0 , G 1 , and G 2 are the response coefficients which, once determined, provide theradiometric calibration of a specific pixel,DN o is the DN offset, unique for each line of data, as determined by an average over thefirst eight "overclock" pixel elements.photodiode laboratory standards. A set of commercially procured HQE photodiodestandards used to establish the calibration of the MISR integrating sphere.radiometric calibration. The determination of the response coefficients used in thecalibration equation representation of a detector’s responsivity. This is a flat-field determination,where use is made of a uniform target such as an integrating sphere or flight diffuse panel.radiometric nomenclature. The International Commission on Illumination, CIEstandards, have been adopted by the National Institute of Standards and Technology, AppliedOptics, The Journal of the Optical Society of America, the Illuminating Engineering Society, andthe American Society of Mechanical Engineers. MISR follows this nomenclature convention, assummarized in the table below.Terms Equations UnitsRadiant flux Φ=δQ/δt, Q=energy (J,erg) WRadiant density at a surface:Radiant exitance M=δΦ/δA W m -2Irradiance E=δΦ/δA W m -2Radiance L=δ 2 Φ/δΩ(δAcosθ) W m -2 sr -1µm -1 .In addition, spectral terms are denoted with a subscript λ, and have the additional unitsradiometric transfer curve. The empirical observations of sensor output to incidentradiance. The radiometric transfer curve is typically approximated by fitting to a calibrationequation with linear, or higher order terms.scene response. The determination of the optical PSF, scatter, pixel uniformity and otherinstrument characterizations from targets other than the uniform calibration targets.A.5 INSTRUMENTA.5.1 On-Board Calibratordiffuse panel. The two diffuse panels are each an assembly within the mechanismssubsystem. The “North Pole Panel” swings aft during calibration to calibrate the forward andIn-flight Radiometric Calibration and Characterization Plan, JPL D-1331585
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10.4.2 Radiative transfer. . . . .
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1. INTRODUCTION1.1 PURPOSEThis docu
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• MISR Algorithm Development Plan
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2.1 MISR SCIENCE OBJECTIVES2. EXPER
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In addition to these modes, the ins
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Table 2.1. Level 1A productProductL
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Table 2.4. Level 1B1 Ancillary Radi
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3. CALIBRATION OVERVIEW3.1 REQUIREM
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equally to filter pinholes or scatt
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PREFLIGHTDATAIFRCCactivityOtheracti
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Multiple methodologies are utilized
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laboratory environment. This includ
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4. PREFLIGHT CALIBRATION AND CHARAC
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Page 61 and 62: 8. CALIBRATION INTEGRITYCalibration
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Page 71 and 72: PRINCIPALINVESTIGATORDavid J. Diner
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Page 81 and 82: APPENDIX A. NOMENCLATUREThe followi
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MISR: In-Flight Radiometric Calibration and Characterization Plan

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