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- W2079129086 abstract "The Gao Fen-1(GF-1) satellite with WFV sensors onboard was launched on April 26, 2013, as part of Gao Fen earthobserving system. The Terra Moderate Resolution Imaging Spectroradiometer (MODIS) has been operational for morethan a decade. With its high accuracy onboard calibration system, the data from MODIS has become a critical componentof numerous applications. Cross-calibration between the sensors is critical to bring the measurements from differentsensors to a common radiometric scale. Because of the differences in the spectral reflectance function (SRF), the measuredphysical quantities can be significantly different while observing the same target. This paper focuses on evaluation theradiometric calibration agreement between GF-1/WFV and Terra/MODIS using the near-simultaneous and cloud-freeimage pairs over Dun huang pseudo-invariant calibration site in the visible and near-infrared spectral range. The SRFdifferences of the analogous WFV and MODIS spectral bands provide the opportunity to explore, understand, quantify,and compensate for the measurement differences between these two sensors. Assuming that the ground target is spectrallyand temporally stable, a typical reflectance spectrum over the Dun huang site obtained by in-situ measurements was usedto compute spectral band adjustment factors (SBAF) for the cross-calibration. No BRDF correction was applied to reducethe seasonal oscillations since the analysis were restricted to only near-nadir images. The cross-calibration was initiallyperformed by comparing the top-of-atmosphere (TOA) reflectance between the two sensors. WFV band 4 has the presenceof the water vapor and oxygen absorption features which is absent from the corresponding MODIS band 2 which made theWFV measured TOA reflectance lower than the MODIS’s. Overall, the average percent differences were consistent towithin 7%. The long-term cross-calibration results reflected that WFV sensor is stable since launch. Although theapplication of the techniques presented in this paper was focused on comparing near- nadir observations from WFV andMODIS reflective solar bands, it can be easily extended and applied to evaluate the differences between any other similarsensors." @default.
- W2079129086 created "2016-06-24" @default.
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- W2079129086 date "2014-11-18" @default.
- W2079129086 modified "2023-10-08" @default.
- W2079129086 title "Multitemporal cross-calibration of GF-1 WFV and Terra MODIS reflective solar bands" @default.
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- W2079129086 doi "https://doi.org/10.1117/12.2070922" @default.
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