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Assessment of Cloud Screening with Apparent Surface Reflectance in Support of the ICESat-2 Mission

机译：支持ICESat-2任务的具有表面反射率的云遮挡评估

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摘要

The separation of cloud and clear scenes is usually one of the first steps in satellite data analysis. Before deriving a geophysical product, almost every satellite mission requires a cloud mask to label a scene as either clear or cloudy through a cloud detection procedure. For clear scenes, products such as surface properties may be retrieved; for cloudy scenes, scientist can focus on studying the cloud properties. Hence the quality of cloud detection directly affects the quality of most satellite operational and research products. This is certainly true for the Ice, Cloud, and land Elevation Satellite-2 (lCESat-2), which is the successor to the ICESat-l. As a top priority mission, ICESat-2 will continue to provide measurements of ice sheets and sea ice elevation on a global scale. Studies have shown that clouds can significantly affect the accuracy of the retrieved results. For example, some of the photons (a photon is a basic unit of light) in the laser beam will be scattered by cloud particles on its way. So instead of traveling in a straight line, these photons are scattered sideways and have traveled a longer path. This will result in biases in ice sheet elevation measurements. Hence cloud screening must be done and be done accurately before the retrievals.
机译：云和清晰场景的分离通常是卫星数据分析的第一步。在获得地球物理产品之前，几乎每个卫星任务都需要一个云遮罩，以通过云检测程序将场景标记为晴朗或多云。对于清晰的场景，可以获取诸如表面特性之类的产品。对于多云的场景，科学家可以专注于研究云的性质。因此，云探测的质量直接影响大多数卫星运行和研究产品的质量。对于ICESat-1的继任者，Iceat，Cloud和Land Elevation Satellite-2（lCESat-2）确实是这样。作为头等任务，ICESat-2将继续在全球范围内提供冰盖和海冰高度的测量。研究表明，云会严重影响检索结果的准确性。例如，激光束中的某些光子（光子是光的基本单位）将在途中被云粒子散射。因此，这些光子不是沿直线传播，而是向侧面散射，并沿更长的路径传播。这将导致冰盖高度测量结果出现偏差。因此，在检索之前必须进行云筛查并准确地进行云筛查。

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