Comparison of MODIS and VIIRS solar diffuser stability monitor performance

Xiong, Xiaoxiong; Fulbright, Jon P.; Angal, Amit; Sun, Junqiang; Wang, Zhipeng

doi:10.1117/12.977567

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…Also illustrated in Figure 3 are the SD degradation trends at different detector wavelengths (bottom), where the larger degradation occurs at shorter wavelength. VIIRS SDSM and SD performance is very similar to MODIS [4]. It was discovered in early 2014 that the solar vector in the S-NPP data was not accurate since launch, which was caused by the misuse of two different Earth centered inertial reference frames in the common geolocation library at the NOAA Interface Data Processing Segment (IDPS) system.…”

Section: On-orbit Performancementioning

confidence: 91%

VIIRS on-orbit calibration and performance update

Xiong

Butler

Chiang

et al. 2014

2014 IEEE Geoscience and Remote Sensing Symposium

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The S-NPP VIIRS was launched on October 28, 2011 and activated on November 8, and then went through a series of intensive functional tests in order to establish the sensor's baseline characteristics and initial on-orbit performance. With the exception of large optical degradation in the NIR and SWIR spectral regions that is due to pre-launch mirror coating contamination, both the VIIRS instrument and its on-board calibrators continue to operate and function normally. With continuous dedicated effort, it is expected that most of the sensor calibration parameters will continue to meet their design requirements and that high quality data products will be continuously generated and used by the operational as well as research community.

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Section: On-orbit Performancementioning

confidence: 91%

VIIRS on-orbit calibration and performance update

Xiong

Butler

Chiang

et al. 2014

2014 IEEE Geoscience and Remote Sensing Symposium

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“…system, large variations existed in its Sun view responses. As a result, an alternative approach was developed by the MODIS Characterization Support Team (MCST) to normalize individual detector responses to those from detector 9 as the SD degradation at this wavelength (0.94 μm) is expected to be extremely small and the patterns in all the detectors are nearly identical 9,12 . In the VIIRS SDSM design, this defect was eliminated.…”

Section: Sd and Sdsm Screenmentioning

confidence: 99%

“…Meanwhile, the SDSM detector responses have also experienced wavelength-dependent degradation, which is larger at longer near-infrared (NIR) wavelengths 12 . For MODIS, the double-sided scan mirror has shown more optical degradation in the VIS spectral region.…”

Section: Introductionmentioning

confidence: 99%

Improvements of VIIRS and MODIS solar diffuser and lunar calibration

et al. 2013

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Both VIIRS and MODIS instruments use solar diffuser (SD) and lunar observations to calibrate their reflective solar bands (RSB). A solar diffuser stability monitor (SDSM) is used to track the SD on-orbit degradation. On-orbit observations have shown similar wavelength-dependent SD degradation (larger at shorter VIS wavelengths) and SDSM detector response degradation (larger at longer NIR wavelengths) for both VIIRS and MODIS instruments. In general, the MODIS scan mirror has experienced more degradation in the VIS spectral region whereas the VIIRS rotating telescope assembly (RTA) mirrors have seen more degradation in the NIR and SWIR spectral region. Because of this wavelength dependent mirror degradation, the sensor's relative spectral response (RSR) needs to be modulated. Due to differences between the solar and lunar spectral irradiance, the modulated RSR could have different effects on the SD and lunar calibration. In this paper, we identify various factors that should be considered for the improvements of VIIRS and MODIS solar and lunar calibration and examine their potential impact. Specifically, we will characterize and assess the calibration impact due to SD and SDSM attenuation screen transmission (uncertainty), SD BRF uncertainty and onorbit degradation, SDSM detector response degradation, and modulated RSR resulting from the sensor's optics degradation. Also illustrated and discussed in this paper are the calibration strategies implemented in the VIIRS and MODIS SD and lunar calibrations and efforts that could be made for future improvements.

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