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Imager-to-radiometer in-flight cross calibration: RSP radiometric comparison with airborne and satellite sensors

机译:成像仪到辐射仪的飞行中交叉校准:与机载和卫星传感器的RSP辐射比对

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摘要

This work develops a method to compare the radiometric calibration between aradiometer and imagers hosted on aircraft and satellites. The radiometer isthe airborne Research Scanning Polarimeter (RSP), which takes multi-angle,photo-polarimetric measurements in several spectral channels. The RSPmeasurements used in this work were coincident with measurements made by theAirborne Visible/Infrared Imaging Spectrometer (AVIRIS), which was on thesame aircraft. These airborne measurements were also coincident with anoverpass of the Landsat 8 Operational Land Imager (OLI). First we compare theRSP and OLI radiance measurements to AVIRIS since the spectral response ofthe multispectral instruments can be used to synthesize a spectrallyequivalent signal from the imaging spectrometer data. We then explore amethod that uses AVIRIS as a transfer between RSP and OLI to show thatradiometric traceability of a satellite-based imager can be used to calibratea radiometer despite differences in spectral channel sensitivities. Thiscalibration transfer shows agreement within the uncertainty of both thevarious instruments for most spectral channels.
机译:这项工作开发了一种方法,可以比较辐射计与飞机和卫星上托管的成像仪之间的辐射校准。辐射计是机载研究扫描旋光仪(RSP),它可以在几个光谱通道中进行多角度光偏振测量。这项工作中使用的RSP测量值与同一飞机上的机载可见/红外成像光谱仪(AVIRIS)进行的测量值一致。这些机载测量结果也与Landsat 8作战地面成像仪(OLI)的天桥相吻合。首先,由于多光谱仪器的光谱响应可用于从成像光谱仪数据合成光谱等效信号,因此我们将RSP和OLI辐射度测量值与AVIRIS进行了比较。然后,我们探索一种使用AVIRIS作为RSP和OLI之间的转移的方法,以显示基于卫星的成像仪的辐射可追溯性可用于校准辐射计,尽管其光谱通道灵敏度存在差异。对于大多数频谱通道,此校准转移显示出在两种仪器的不确定性范围内的一致性。

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