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OSIS: remote sensing code for estimating aerosol optical properties in urban areas from very high spatial resolution images

机译：OSIS：遥感代码，用于从非常高的空间分辨率图像中估算城市地区的气溶胶光学特性

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The achievement of new satellite or airborne remote sensing instruments enables the more precise study of cities with metric spatial resolutions. For studies such as the radiative characterization of urban features, knowledge of the atmosphere and particularly of aerosols is required to perform first an atmospheric compensation of the remote sensing images. However, to our knowledge, no efficient aerosol characterization technique adapted both to urban areas and to very high spatial resolution images has yet been developed. The goal of this paper is so to present a new code to characterize aerosol optical properties, OSIS, adapted to urban remote sensing images of metric spatial resolution acquired in the visible and near-IR spectral domains. First, a new aerosol characterization method based on the observation of shadow/sun transitions is presented, offering the advantage to avoid the assessment of target reflectances. Its principle and the modeling of the signal used to solve the retrieval equation are then detailed. Finally, a sensitivity study of OSIS from synthetic images simulated by the radiative transfer code AMARTIS v2 is also presented. This study has shown an intrinsic precision of this tool of (DELTA)(tau)_(a) velence 0.1.(tau)_(a) +- (0.02 + 0.4.(tau)_(a)) for retrieval of aerosol optical thicknesses. This study shows that OSIS is a powerful tool for aerosol characterization that has a precision similar to satellite products for the aerosol optical thicknesses retrieval and that can be applied to every very high spatial resolution instrument, multispectral or hyperspectral, airborne or satellite.
机译：新的卫星或机载遥感仪器的成功实现，可以对具有公制空间分辨率的城市进行更精确的研究。对于诸如城市特征的辐射表征之类的研究，需要大气知识，尤其是气溶胶知识，才能首先对遥感影像进行大气补偿。然而，据我们所知，尚未开发出既适用于城市区域又适用于非常高的空间分辨率图像的有效气溶胶表征技术。因此，本文的目的是提出一种表征气溶胶光学特性的新代码OSIS，该代码适用于在可见光谱和近红外光谱域中获取的具有度量空间分辨率的城市遥感图像。首先，提出了一种基于对阴影/太阳过渡的观测的新型气溶胶表征方法，具有避免评估目标反射率的优势。然后详细介绍了其原理和用于求解检索方程的信号建模。最后，还提出了由辐射转移码AMARTIS v2模拟的合成图像对OSIS的敏感性研究。这项研究表明，该工具的内在精度为DELTA（tau）_（a）velence 0.1。（tau）_（a）+-（0.02 + 0.4。（tau）_（a））光学厚度。这项研究表明，OSIS是用于气溶胶表征的强大工具，其精度与用于气溶胶光学厚度检索的卫星产品相似，并且可以应用于每一个非常高空间分辨率的仪器（多光谱或高光谱，机载或卫星）。

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