In situ determination of the remote sensing reflectance : an inter comparison
In situ determination of the remote sensing reflectance : an inter comparison
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DOI：
10.5194/os-8-567-2012
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发表时间：
2012-08
期刊：
影响因子：
3.2
通讯作者：
G. Zibordi;K. Ruddick;I. Ansko;G. Moore;S. Kratzer;J. Icely;A. Reinart
中科院分区：
文献类型：
--
作者：
G. Zibordi;K. Ruddick;I. Ansko;G. Moore;S. Kratzer;J. Icely;A. Reinart
抽象的。使用独立系统和方法进行同步测量的数据产品的相互比较是评估数据一致性并调查不确定性的可行方法。在此背景下，在亚得里亚海北部的 Acqua Alta 海洋学塔进行了名为“沿海水域遥感应用原位辐射能力评估”(ARC) 的相互比较，以探讨各种水下和水上光学系统和方法的原位数据产品的准确性。测量是在几乎理想的条件下进行的，包括稳定的部署平台、晴朗的天空、相对较低的太阳天顶角和中等低的海况。此外，实验中涉及的所有光学传感器都通过使用相同标准和方法进行的绝对辐射校准进行了相互校准。相互比对的数据产品包括光谱出水辐射亮度Lw(λ)、水面向下辐照度Ed(0+,λ)和遥感反射率Rrs(λ)。将来自各种测量系统/方法的数据产品直接与来自单个参考系统/方法的数据产品进行比较。 Rrs(λ)的结果表明相对差异的光谱平均值在-1和+6%之间，而绝对差异的光谱平均值从水上系统/方法的大约6%到基于浮标的系统/方法的9%不等。 Rrs(λ) 光谱相对差异与相互比较的系统/方法的组合不确定性估计之间的一致性值得注意。
Abstract. Inter-comparison of data products from simultaneous measurements performed with independent systems and methods is a viable approach to assess the consistency of data and additionally to investigate uncertainties. Within such a context the inter-comparison called Assessment of In Situ Radiometric Capabilities for Coastal Water Remote Sensing Applications (ARC) was carried out at the Acqua Alta Oceanographic Tower in the northern Adriatic Sea to explore the accuracy of in situ data products from various in- and above-water optical systems and methods. Measurements were performed under almost ideal conditions, including a stable deployment platform, clear sky, relatively low sun zenith angles and moderately low sea state. Additionally, all optical sensors involved in the experiment were inter-calibrated through absolute radiometric calibration performed with the same standards and methods. Inter-compared data products include spectral water-leaving radiance Lw (λ), above-water downward irradiance Ed(0+,λ) and remote sensing reflectance Rrs(λ). Data products from the various measurement systems/methods were directly compared to those from a single reference system/method. Results for Rrs(λ) indicate spectrally averaged values of relative differences comprised between −1 and +6%, while spectrally averaged values of absolute differences vary from approximately 6% for the above-water systems/methods to 9% for buoy-based systems/methods. The agreement between Rrs(λ) spectral relative differences and estimates of combined uncertainties of the inter-compared systems/methods is noteworthy.