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首页> 外文期刊>Remote Sensing of Environment: An Interdisciplinary Journal >Radiometric comparison of multispectral imagers over a pseudo-invariant calibration site using a reference radiometric model
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Radiometric comparison of multispectral imagers over a pseudo-invariant calibration site using a reference radiometric model

机译：使用参考辐射模型在伪不变校准站点上对多光谱成像仪进行辐射比较

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A model is proposed to simulate top-of-atmosphere (TOA) observations in the visible to near-infrared (NIR) spectral range, over a pseudo-invariant calibration site, the so-called Libya-4 site. The model is based on a fully physical radiative transfer model simulating the coupling between a realistic atmosphere and a spectral surface Bidirectional Reflectance Distribution Function (BRDF) model parameterised by 4 free parameters. At first, the model is 'calibrated' on 4years of MERIS observations by inverting the 4 free parameters of the surface BRDF model that provide the best fit to the MERIS observations. The model mimics the MERIS TOA observations with a precision of approximately 1% RMSE outside water vapour and O_2 absorption features. The inverted BRDF model parameters obtained at MERIS spectral bands are then spectrally interpolated and used as input to the radiative transfer model to simulate observations from ATSR-2, AATSR, A-MODIS, MERIS, POLDER-3 and VEGETATION-2 over the 2002 to 2012 period. Depending on the spectral band considered, AATSR radiometry appears 2% to 3% above the model 'calibrated' on MERIS radiometry, A-MODIS is 0% to 3% below, POLDER-3 is 2% to 4% below and VEGETATION-2 about 4% below. ATSR-2 data during the 2002 to early 2003 period are almost 10% below their simulations. Temporal trends between simulations and observations are also measured for all sensors. The smallest linear trends are observed for the MERIS 3rd reprocessing data (below 1%/decade). The temporal trends obtained from all sensors against the coupled surface-atmosphere model are in line with expected residual errors of instrument degradation model used in temporal extrapolation: larger in blue than in the NIR. The combined temporal trends from all sensors tend to demonstrate that the Libia-4 site is radiometrically stable in the visible to the NIR to better than 1%/decade for the 2002-2012 period, thus quantitatively confirming that it is a terrestrial target particularly adequate for the assessment of the temporal stability of Earth Observation sensors.
机译：提出了一个模型，用于在伪不变校准站点（即所谓的Libya-4站点）上模拟可见光到近红外（NIR）光谱范围内的大气顶（TOA）观测。该模型基于完全物理辐射传递模型，该模型模拟了真实大气与由4个自由参数参数化的光谱表面双向反射分布函数（BRDF）模型之间的耦合。首先，通过反转曲面BRDF模型的4个自由参数来对MERIS观测值进行最佳拟合，从而对MERIS观测值进行4年的“校准”。该模型模拟MERIS TOA观测值，其外部水蒸气和O_2吸收特征的精度约为1％RMSE。然后，对在MERIS光谱带获得的倒置BRDF模型参数进行光谱插值，并用作辐射传递模型的输入，以模拟从2002年到2002年ATSR-2，AATSR，A-MODIS，MERIS，POLDER-3和VEGETATION-2的观测结果。 2012年期间。根据所考虑的光谱带，AATSR放射线比在MERIS放射线上“校准”的模型高出2％至3％，A-MODIS低于0％至3％，POLDER-3低于2％至4％，而VEGETATION-2大约低于4％。 2002年至2003年初期间的ATSR-2数据比其模拟结果低近10％。还测量了所有传感器在模拟和观测之间的时间趋势。对于MERIS第3次再处理数据，观察到最小的线性趋势（低于1％/十年）。从所有传感器针对耦合的表面-大气模型获得的时间趋势与时间外推法所使用的仪器退化模型的预期残留误差相符：蓝色大于NIR。来自所有传感器的综合时间趋势趋向于表明，在2002-2012年期间，Libia-4站点在NIR可见光辐射稳定方面优于1％/十年，因此从数量上确定了它是特别合适的地面目标用于评估地球观测传感器的时间稳定性。

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