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APDA Water Vapor Retrieval Validation for Sentinel-2 Imagery

机译:用于Sentinel-2影像的APDA水蒸气检索验证

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Water vapor is one of the main parameters for the atmospheric correction of Sentinel-2 imagery. Together with the aerosol retrieval, it determines the accuracy of the surface reflectance product. Since Sentinel-2A and soon Sentinel-2B are operational satellites with a free data policy, there is great interest in processing these data and using them for environmental studies. This letter performs a validation of Sentinel-2 retrieved water vapor over land by comparing the scene-derived water vapor column with the Aerosol Robotic Network (AERONET) measurement as an independent source. The validation is performed for a large range of AERONET site elevations and solar zenith angles using the atmospheric precorrected differential absorption technique. Results show a high correlation with a low root-mean-square error of about 0.1 cm for water vapor values from 0.2 to 5 cm.
机译:水蒸气是Sentinel-2影像进行大气校正的主要参数之一。与气溶胶回收一起,它可以确定表面反射率产品的准确性。由于Sentinel-2A和即将推出的Sentinel-2B是具有免费数据政策的可运行卫星,因此人们非常关注处理这些数据并将其用于环境研究。这封信通过将场景派生的水蒸气柱与作为独立来源的气溶胶机器人网络(AERONET)测量值进行比较,对Sentinel-2陆地上回收的水蒸气进行了验证。使用大气预校正差分吸收技术对大范围的AERONET站点标高和太阳天顶角进行了验证。结果表明,对于水蒸气值从0.2到5 cm的情况,均方根误差约为0.1 cm,具有很高的相关性。

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