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The Incorporation of Atmospheric Variability in Hyperspectral Synthetic Scene Simulation

机译：大气变化在高光谱合成场景模拟中的结合

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This paper describes an effort to improve the modeling of the atmosphere in the Digital Imaging and Remote Sensing Image Generation (DIRSIG) model. The goal of this research can be divided into two main areas. The first is to improve the existing manner in which DIRSIG samples and references the atmosphere. The second is to give DIRSIG the ability to incorporate atmospheric inhomogeneities, as well as, the ability to accurately model them. DIRSIG has limitations in how it currently samples the atmosphere. From a geometric standpoint, it does not fully sample the energy which is scattered by the atmosphere towards the sensor (upwelled radiance). There are also other geometric issues which lead to inaccurate modeling results. One significant inaccuracy is the fact that DIRSIG can miscalculate the atmospheric effects resulting from modeling objects with non-zero altitudes. The plan is to correct this by completely reworking the procedure and geometry used by DIRSIG to sample the atmosphere. This research also addresses the effects of an inhomogeneous atmosphere and includes methods to model this variability in synthetic scenes. DIRSIG currently utilizes a single atmospheric look up table (LUT) that it references when creating an image. This LUT contains the information DIRSIG will need to predict the various radiance and transmission values for a homogeneous sky. There is no ability for DIRSIG to make one part of the sky optically thick, and the other clear. This will be remedied by having DIRSIG create a series of LUTs with different atmospheric properties that it can reference. With this ability DIRSIG can reference an optically different atmosphere depending on its viewing geometry, allowing a horizontally varying atmosphere.
机译：本文介绍了在数字成像和遥感图像生成（DIRSIG）模型中改进大气建模的工作。这项研究的目标可以分为两个主要领域。首先是改善DIRSIG采样和参考大气的现有方式。第二个是使DIRSIG能够合并大气不均匀性，并能够对它们进行精确建模。 DIRSIG在目前对大气采样的方式上有局限性。从几何学的角度来看，它不能完全采样被大气散射向传感器的能量（辐射强度上升）。还有其他几何问题会导致不正确的建模结果。一个重大的不准确性是DIRSIG可能会错误地计算由于对非零高度的对象进行建模而产生的大气效应。计划是通过完全修改DIRSIG用于采样大气的过程和几何形状来纠正此问题。这项研究还解决了不均匀大气的影响，并包括了对合成场景中这种可变性进行建模的方法。 DIRSIG当前使用创建图像时引用的单个大气查找表（LUT）。该LUT包含DIRSIG预测均匀天空的各种辐射和透射值所需的信息。 DIRSIG无法将天空的一部分光学增厚，而另一部分则变得清晰。通过使DIRSIG创建可以参考的具有不同大气特性的一系列LUT，可以解决此问题。借助此功能，DIRSIG可以根据其观察几何体参考不同的光学气氛，从而实现水平变化的气氛。

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