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Kyba, C.C.M.; Bouroussis, C.; Canal-Domingo, R.; Falchi, F.; Giacomelli, A.; Hänel, A.; Kolláth, Z.; Massetti, L.; Ribas, S.J.; Spoelstra, H.; Tong, K.P.; Wuchterl, G. |
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Title |
Report of the 2015 LoNNe Intercomparison Campaign |
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Journal Article |
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2015 |
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skyglow; instrumentation |
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LoNNe @ kyba @; IDA @ john @; GFZ @ kyba @ |
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1255 |
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Author |
Blonski, S.; Cao, C. |
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Title |
Suomi NPP VIIRS Reflective Solar Bands Operational Calibration Reprocessing |
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Journal Article |
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Year |
2015 |
Publication |
Remote Sensing |
Abbreviated Journal |
Remote Sensing |
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Volume |
7 |
Issue |
12 |
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16131-16149 |
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Keywords |
Instrumentation |
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2072-4292 |
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LoNNe @ kyba @ |
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1310 |
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Qiu, S.; Shao, X.; Cao, C.; Uprety, S. |
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Title |
Feasibility demonstration for calibrating Suomi-National Polar-Orbiting Partnership Visible Infrared Imaging Radiometer Suite day/night band using Dome C and Greenland under moon light |
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Journal Article |
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2016 |
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Journal of Applied Remote Sensing |
Abbreviated Journal |
J. Appl. Remote Sens |
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10 |
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1 |
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016024 |
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Remote Sensing; Instrumentation |
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The day/night band (DNB) of the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard Suomi National Polar-orbiting Partnership (Suomi-NPP) represents a major advancement in night time imaging capabilities. DNB covers almost seven orders of magnitude in its dynamic range from full sunlight to half-moon. To achieve this large dynamic range, it uses four charge-coupled device arrays in three gain stages. The low gain stage (LGS) gain is calibrated using the solar diffuser. In operations, the medium and high gain stage values are determined by multiplying the gain ratios between the medium gain stage, and LGS, and high gain stage (HGS) and LGS, respectively. This paper focuses on independently verifying the radiometric accuracy and stability of DNB HGS using DNB observations of ground vicarious calibration sites under lunar illumination at night. Dome C in Antarctica in the southern hemisphere and Greenland in the northern hemisphere are chosen as the vicarious calibration sites. Nadir observations of these high latitude regions by VIIRS are selected during perpetual night season, i.e., from April to August for Dome C and from November to January for Greenland over the years 2012 to 2013. Additional selection criteria, such as lunar phase being more than half-moon and no influence of straylight effects, are also applied in data selection. The lunar spectral irradiance model, as a function of Sun–Earth–Moon distances and lunar phase, is used to determine the top-of-atmosphere reflectance at the vicarious site. The vicariously derived long-term reflectance from DNB observations agrees with the reflectance derived from Hyperion observations. The vicarious trending of DNB radiometric performance using DOME-C and Greenland under moon light shows that the DNB HGS radiometric variability (relative accuracy to lunar irradiance model and Hyperion observation) is within 8%. Residual variability is also discussed. |
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1931-3195 |
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LoNNe @ kyba @ |
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1372 |
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Author |
Lee, S.; Cao, C. |
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Title |
Soumi NPP VIIRS Day/Night Band Stray Light Characterization and Correction Using Calibration View Data |
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Journal Article |
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Year |
2016 |
Publication |
Remote Sensing |
Abbreviated Journal |
Remote Sensing |
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Volume |
8 |
Issue |
2 |
Pages |
138 |
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Keywords |
Instrumentation |
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Abstract |
The Soumi NPP VIIRS Day/Night Band (DNB) nighttime imagery quality is affected by stray light contamination. In this study, we examined the relationship between the Earth scene stray light and the signals in VIIRS’s calibrators to better understand stray light characteristics and to improve upon the current correction method. Our analyses showed the calibrator signal to be highly predictive of Earth scene stray light and can provide additional stray light characteristics that are difficult to obtain from Earth scene data alone. In the current stray light correction regions (mid-to-high latitude), the stray light onset angles can be tracked by calibration view data to reduce correction biases. In the southern hemisphere, it is possible to identify the angular extent of the additional stray light feature in the calibration view data and develop a revised correction method to remove the additional stray light occurring during the southern hemisphere springtime. Outside of current stray light correction region, the analysis of calibration view data indicated occasional stray light contamination at low latitude and possible background biases caused by Moon illumination. As stray light affects a significant portion of nighttime scenes, further refinement in characterization and correction is important to ensure VIIRS DNB imagery quality for Soumi NPP and future missions. |
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2072-4292 |
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LoNNe @ kyba @ |
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1378 |
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Author |
Choi, T.; Shao, X.; Cao, C.; Weng, F. |
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Title |
Radiometric Stability Monitoring of the Suomi NPP Visible Infrared Imaging Radiometer Suite (VIIRS) Reflective Solar Bands Using the Moon |
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Journal Article |
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Year |
2016 |
Publication |
Remote Sensing |
Abbreviated Journal |
Remote Sensing |
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8 |
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1 |
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15 |
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Instrumentation |
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The Suomi NPP (S-NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) performs the scheduled lunar roll maneuver on a monthly basis. The lunar calibration coefficients and lunar F-factor are calculated by taking the ratio of the lunar observed radiance to the simulated radiance from the Miller and Turner (MT) lunar model. The lunar F-factor is also validated against that derived from the VIIRS Solar Diffuser (SD). The MT model-based lunar F-factors in general agree with SD F-factors. The Lunar Band Ratio (LBR) is also derived from two channel lunar radiances and is implemented in the National Oceanic and Atmospheric Administration (NOAA) Integrated Calibration and Validation System (ICVS) to monitor the VIIRS long-term radiometric performance. The lunar radiances at pixels are summed for each of the VIIRS Reflective Solar Bands (RSBs) and normalized by the reference band M11 which has the most stable SD-based calibration coefficient. LBRs agree with the SD based F-factor ratios within one percent. Based on analysis with these two independent lunar calibration methods, SD-based and LBR-based calibrations show a lifetime consistency. Thus, it is recommended that LBR be used for both VIIRS radiometric calibration and lifetime stability monitoring. |
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2072-4292 |
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LoNNe @ kyba @ |
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1384 |
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