Moderate-Resolution Imaging Spectroradiometer ocean color polarization correction

Meister, Gerhard; Kwiatkowska, Ewa; Franz, Bryan A.; Patt, Frederick S.; Feldman, Gene C.; McClain, Charles R.

doi:10.1364/ao.44.005524

Cited by 79 publications

(55 citation statements)

References 19 publications

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“…It was optimized during the design phase and was characterized before launch. Prelaunch measurements showed polarization amplitudes increasing toward the higher mirror AOIs and adding up to 2 % for most ocean-color bands, except for band B8 (412 nm), where the amplitude was ∼ 5 %; it was below 2 % for the visible land bands (B3, B1, B4) (Meister et al, 2005).…”

Section: Polarization Correction Of Modis Terra Datamentioning

confidence: 92%

Scientific impact of MODIS C5 calibration degradation and C6+ improvements

et al. 2014

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Abstract. The Collection 6 (C6) MODIS (Moderate Resolution Imaging Spectroradiometer) land and atmosphere data sets are scheduled for release in 2014. C6 contains significant revisions of the calibration approach to account for sensor aging. This analysis documents the presence of systematic temporal trends in the visible and near-infrared (500 m) bands of the Collection 5 (C5) MODIS Terra and, to lesser extent, in MODIS Aqua geophysical data sets. Sensor degradation is largest in the blue band (B3) of the MODIS sensor on Terra and decreases with wavelength. Calibration degradation causes negative global trends in multiple MODIS C5 products including the dark target algorithm's aerosol optical depth over land and Ångström exponent over the ocean, global liquid water and ice cloud optical thickness, as well as surface reflectance and vegetation indices, including the normalized difference vegetation index (NDVI) and enhanced vegetation index (EVI). As the C5 production will be maintained for another year in parallel with C6, one objective of this paper is to raise awareness of the calibration-related trends for the broad MODIS user community. The new C6 calibration approach removes major calibrations trends in the Level 1B (L1B) data. This paper also introduces an enhanced C6+ calibration of the MODIS data set which includes an additional polarization correction (PC) to compensate for the increased polarization sensitivity of MODIS Terra since about 2007, as well as detrending and TerraAqua cross-calibration over quasi-stable desert calibration sites. The PC algorithm, developed by the MODIS ocean biology processing group (OBPG), removes residual scan angle, mirror side and seasonal biases from aerosol and surface reflectance (SR) records along with spectral distortions of SR. Using the multiangle implementation of atmospheric correction (MAIAC) algorithm over deserts, we have also developed a detrending and cross-calibration method which removes residual decadal trends on the order of several tenths of 1 % of the top-of-atmosphere (TOA) reflectance in the visible and near-infrared MODIS bands B1-B4, and provides a good consistency between the two MODIS sensors. MA-IAC analysis over the southern USA shows that the C6+ approach removed an additional negative decadal trend of Terra NDVI ∼ 0.01 as compared to Aqua data. This change is particularly important for analysis of vegetation dynamics and trends in the tropics, e.g., Amazon rainforest, where the morning orbit of Terra provides considerably more cloudfree observations compared to the afternoon Aqua measurements.

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Section: Polarization Correction Of Modis Terra Datamentioning

confidence: 92%

Scientific impact of MODIS C5 calibration degradation and C6+ improvements

et al. 2014

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“…In this equation the effects of sun glint and whitecaps are omitted because during the quality control step data associated with these artifacts can be discarded. The effects of water vapor, oxygen absorption, or light polarization are negligible for the 250-m bands (e.g., Meister et al, 2005). The terms on the right-hand side of Eq.…”

Section: Cross-calibration Of the Modis 250-m With 1-km Bandsmentioning

confidence: 99%

Monitoring turbidity in Tampa Bay using MODIS/Aqua 250-m imagery

Chen

Muller‐Karger

2007

Remote Sensing of Environment

265

139

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“…usually contribute on the order of at least 0.1%. [7][8][9] The advantage of the higher SNR of bands 13H and 14H is too small to have a meaningful impact.…”

Section: Signal-to-noise Ratiomentioning

confidence: 99%

Radiometric quality of the MODIS bands at 667 and 678nm

Meister

Franz

2011

SPIE Proceedings

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The MODIS instruments on Terra and Aqua were designed to allow the measurement of chlorophyll fluorescence effects over ocean. The retrieval algorithm is based on the difference between the water-leaving radiances at 667nm and 678nm. The water-leaving radiances at these wavelengths are usually very low relative to the topof-atmosphere radiances. The high radiometric accuracy needed to retrieve the small fluorescence signal lead to a dual gain design for the 667 and 678nm bands. This paper discusses the benefits obtained from this design choice and provides justification for the use of only one set of gains for global processing of ocean color products. Noise characteristics of the two bands and their related products are compared to other products of bands from 412nm to 2130nm. The impact of polarization on the two bands is discussed. In addition, the impact of stray light on the two bands is compared to other MODIS bands.

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Moderate-Resolution Imaging Spectroradiometer ocean color polarization correction

Cited by 79 publications

References 19 publications

Scientific impact of MODIS C5 calibration degradation and C6+ improvements

Scientific impact of MODIS C5 calibration degradation and C6+ improvements

Monitoring turbidity in Tampa Bay using MODIS/Aqua 250-m imagery

Radiometric quality of the MODIS bands at 667 and 678nm

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