Cross calibration of ocean-color bands from Moderate Resolution Imaging Spectroradiometer on Terra platform

Kwiatkowska, Ewa; Franz, Bryan A.; Meister, Gerhard; McClain, Charles R.; Xiong, Xiaoxiong

doi:10.1364/ao.47.006796

Cited by 101 publications

(75 citation statements)

References 40 publications

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“…To limit the data set for the 500 m channels (20 detectors), the M coefficients are generated for the neighboring detector pairs, in other words, at 1 km resolution. For the near-nadir geometries, where azimuthal angle changes rapidly, one should also consider rotation angle α, which is the angle between the sensor reference (scan) plane, with respect to which the Mueller matrix is defined, and plane of observation, defined by the normal to the surface and view direction, with respect to which the Q and U components are calculated (for detail, see Meister et al, 2012;Kwiatkowska et al, 2008;Gordon et al, 1997). Once PC coefficients are produced, Eq.…”

Section: Polarization Correction Of Modis Terra Datamentioning

confidence: 99%

“…This discipline is very sensitive to the sensor calibration and its temporal changes because the signal used in biomonitoring of the world ocean ("ocean color") is small. The significant temporal drifts of the MODIS Terra ocean color record from the more stable MODIS Aqua and, particularly, the benchmark SeaWiFS (Sea-viewing Wide Fieldof-view Sensor) record were documented in Kwiatkowska et al (2008). These studies also showed that the calibration degradation effect is largest in the shortwave spectrum and rapidly decreases with wavelength.…”

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confidence: 94%

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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: 99%

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confidence: 94%

Scientific impact of MODIS C5 calibration degradation and C6+ improvements

et al. 2014

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“…This led to a long-term drift in calibration, most pronounced on the Terra sensor, with the largest in the blue band (B3), and decreasing with increasing wavelength (Xiong and Barnes, 2006). The discovery of systemic nonphysical trends in MODIS Terra products by science users (e.g., Kwiatkowska et al, 2008;Levy et al, 2010;Wang et al, 2012) motivated research into independent trend characterization for C6 calibration. Analysis of observations of remote desert targets that were assumed to be nearly invariant over the long term were used to constrain the long-term drift of the observations.…”

Section: Introductionmentioning

confidence: 99%

Impact of MODIS sensor calibration updates on Greenland Ice Sheet surface reflectance and albedo trends

2017

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Abstract. We evaluate Greenland Ice Sheet (GrIS) surface reflectance and albedo trends using the newly released Collection 6 (C6) MODIS (Moderate Resolution Imaging Spectroradiometer) products over the period [2001][2002][2003][2004][2005][2006][2007][2008][2009][2010][2011][2012][2013][2014][2015][2016]. We find that the correction of MODIS sensor degradation provided in the new C6 data products reduces the magnitude of the surface reflectance and albedo decline trends obtained from previous MODIS data (i.e., Collection 5, C5). Collection 5 and 6 data product analysis over GrIS is characterized by surface (i.e., wet vs. dry) and elevation (i.e., 500-2000 m, 2000 m and greater) conditions over the summer season from 1 June to 31 August. Notably, the visible-wavelength declining reflectance trends identified in several bands of MODIS C5 data from previous studies are only slightly detected at reduced magnitude in the C6 versions over the dry snow area. Declining albedo in the wet snow and ice area remains over the MODIS record in the C6 product, albeit at a lower magnitude than obtained using C5 data. Further analyses of C6 spectral reflectance trends show both reflectance increases and decreases in select bands and regions, suggesting that several competing processes are contributing to Greenland Ice Sheet albedo change. Investigators using MODIS data for other ocean, atmosphere and/or land analyses are urged to consider similar re-examinations of trends previously established using C5 data.

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“…Similarly, any changes to instrument behavior on-orbit, or deviation from prelaunch understanding of known anomalies, would require either new corrections or modification to existing ones. For heritage instruments, this process can require a lengthy time series, as was the experience with MODIS, on the EOS satellites Aqua 5 and Terra, 6 in determining the polarization response on-orbit. To produce a consistent data record, any new or revised correction will need to be applied retrospectively.…”

Section: Processing Systemmentioning

confidence: 99%

“…However, if the degradation measured by the SDSM is large, it is likely that the SD reflectance for the VIIRS telescope view angle is significantly different. These effects could be responsible for the corrections that need to be applied to the MODIS Terra SD measurements 6 . In that case, the MODIS Terra SD door became stuck open due to a mechanism malfunction in May 2003, leading to a large increase in the rate of degradation of the SD reflectance; both the SD reflectance degradation and the required corrections are largest at 412nm.…”

Section: Solar Diffuser Reflectance Degradationmentioning

confidence: 99%

Assessment of NPP VIIRS ocean color data products: hope and risk

et al. 2011

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For several years, the NASA/Goddard Space Flight Center (GSFC) NPP VIIRS Ocean Science Team (VOST) provided substantial scientific input to the NPP project regarding the use of Visible Infrared Imaging Radiometer Suite (VIIRS) to create science quality ocean color data products. This work has culminated into an assessment of the NPP project and the VIIRS instrument's capability to produce science quality Ocean Color data products. The VOST concluded that many characteristics were similar to earlier instruments, including SeaWiFS or MODIS Aqua. Though instrument performance and calibration risks do exist, it was concluded that programmatic and algorithm issues dominate concerns.

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Cross calibration of ocean-color bands from Moderate Resolution Imaging Spectroradiometer on Terra platform

Cited by 101 publications

References 40 publications

Scientific impact of MODIS C5 calibration degradation and C6+ improvements

Scientific impact of MODIS C5 calibration degradation and C6+ improvements

Impact of MODIS sensor calibration updates on Greenland Ice Sheet surface reflectance and albedo trends

Assessment of NPP VIIRS ocean color data products: hope and risk

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