VIIRS F1 "best" relative spectral response characterization by the government team

Moeller, Christopher C.; McIntire, Jeff; Schwarting, Tom; Moyer, David

doi:10.1117/12.894552

Cited by 20 publications

(18 citation statements)

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“…The unusually large out-of-band RSR at wavelengths larger than that for the central peak for the M1 band, coupled with a radiance source redder than the Sun, leads to a computed spectral radiance smaller than what it should be. Consequently, 1 c for the M1 band is smaller than what it should be, yielding a large F-factor. The other major feature in Fig.…”

Section: Resultsmentioning

confidence: 97%

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Initial on-orbit radiometric calibration of the Suomi NPP VIIRS reflective solar bands

et al. 2012

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The on-orbit radiometric response calibration of the VISible/Near InfraRed (VISNIR) and the Short-Wave InfraRed (SWIR) bands of the Visible/Infrared Imager/Radiometer Suite (VIIRS) aboard the Suomi National Polar-orbiting Partnership (NPP) satellite is carried out through a Solar Diffuser (SD). The transmittance of the SD screen and the SD's Bidirectional Reflectance Distribution Function (BRDF) are measured before launch and tabulated, allowing the VIIRS sensor aperture spectral radiance to be accurately determined. The radiometric response of a detector is described by a quadratic polynomial of the detector's digital number (dn). The coefficients were determined before launch. Once on orbit, the coefficients are assumed to change by a common factor: the F-factor. The radiance scattered from the SD allows the determination of the F-factor. In this Proceeding, we describe the methodology and the associated algorithms in the determination of the F-factors and discuss the results.

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Section: Resultsmentioning

confidence: 97%

“…The design specified and the measured band central wavelengths and widths can be found in Ref. 1. Although carefully calibrated before launch, the on-orbit VIIRS sensor's radiometric response can change substantially with time as seen in MODIS 2 .…”

Section: Introductionmentioning

confidence: 99%

Initial on-orbit radiometric calibration of the Suomi NPP VIIRS reflective solar bands

et al. 2012

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“…Located in the east Antarctic, Dome C is covered by snow and has an extremely small terrain surface slope. The altitude of the site is 3200 m. Its uniformity properties produce temporally invariant reflectance and BRDF spectral response [11,12]. It has a clear atmosphere with minimized influence of aerosol and atmospheric water vapor when compared with other reference sites [12].…”

Section: Reference Sitesmentioning

confidence: 99%

“…The altitude of the site is 3200 m. Its uniformity properties produce temporally invariant reflectance and BRDF spectral response [11,12]. It has a clear atmosphere with minimized influence of aerosol and atmospheric water vapor when compared with other reference sites [12]. Since the Dome C site is close to the South Pole of the Earth, VIIRS can make several overpasses in any given day and it is easy to find a good daytime image near nadir observation during the southern hemisphere summer period, from October to March [9].…”

Section: Reference Sitesmentioning

confidence: 99%

Using Ground Targets to Validate S-NPP VIIRS Day-Night Band Calibration

Chen

Xiong

et al. 2016

Remote Sensing

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Abstract:In this study, the observations from S-NPP VIIRS Day-Night band (DNB) and Moderate resolution bands (M bands) of Libya 4 and Dome C over the first four years of the mission are used to assess the DNB low gain calibration stability. The Sensor Data Records produced by NASA Land Product Evaluation and Algorithm Testing Element (PEATE) are acquired from nearly nadir overpasses for Libya 4 desert and Dome C snow surfaces. A kernel-driven bidirectional reflectance distribution function (BRDF) correction model is used for both Libya 4 and Dome C sites to correct the surface BRDF influence. At both sites, the simulated top-of-atmosphere (TOA) DNB reflectances based on SCIAMACHY spectral data are compared with Land PEATE TOA reflectances based on modulated Relative Spectral Response (RSR). In the Libya 4 site, the results indicate a decrease of 1.03% in Land PEATE TOA reflectance and a decrease of 1.01% in SCIAMACHY derived TOA reflectance over the period from April 2012 to January 2016. In the Dome C site, the decreases are 0.29% and 0.14%, respectively. The consistency between SCIAMACHY and Land PEATE data trends is good. The small difference between SCIAMACHY and Land PEATE derived TOA reflectances could be caused by changes in the surface targets, atmosphere status, and on-orbit calibration. The reflectances and radiances of Land PEATE DNB are also compared with matching M bands and the integral M bands based on M4, M5, and M7. The fitting trends of the DNB to integral M bands ratios indicate a 0.75% decrease at the Libya 4 site and a 1.89% decrease at the Dome C site. Part of the difference is due to an insufficient number of sampled bands available within the DNB wavelength range. The above results indicate that the Land PEATE VIIRS DNB product is accurate and stable. The methods used in this study can be used on other satellite instruments to provide quantitative assessments for calibration stability.

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“…where RSR is the relative spectral response of the mid-detector in band B 6,9,10 and c 0 , c 1 , and c 2 are computed with prelaunch determined values with detector focal plane and control electronics temperatures corrections 6,11 . In (6), we…”

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Examination of the angular dependence of the SNPP VIIRS solar diffuser BRDF degradation factor

Lei

Chiang

Xiong

2014

Earth Observing Systems XIX

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Modern Earth-orbiting Earth-observing remote sensing sensors often use onboard solar diffusers (SD) to calibrate their reflective solar bands (RSB), such as the Visible Infrared Imaging Radiometer Suite (VIIRS) aboard the Suomi National Polar-orbiting Partnership (SNPP) satellite. The SD's optical scattering property is measured by a bidirectional reflectance distribution function (BRDF). Once on orbit, the BRDF is found to degrade over time and the degradation factor is determined by, in the case of the SNPP VIIRS, an onboard solar diffuser stability monitor (SDSM) which observes the SD at a fixed view angle (relative to the SD surface). The SNPP VIIRS RSB however, observes the SD at a different angle. It is conventionally assumed (for cases like VIIRS) that the angular dependence of the BRDF degradation factor is negligible and hence the degradation factor determined by the SDSM is used to calibrate the RSB. We examine the angular dependence of the SNPP VIIRS SD BRDF degradation factor. We find that the degradation factor is clearly angle dependent when the SD BRDF degrades enough (< 0.98), and the larger the degradation the stronger the dependency.

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VIIRS F1 "best" relative spectral response characterization by the government team

Cited by 20 publications

References 0 publications

Initial on-orbit radiometric calibration of the Suomi NPP VIIRS reflective solar bands

Initial on-orbit radiometric calibration of the Suomi NPP VIIRS reflective solar bands

Using Ground Targets to Validate S-NPP VIIRS Day-Night Band Calibration

Examination of the angular dependence of the SNPP VIIRS solar diffuser BRDF degradation factor

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