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Sentinel-2A image quality commissioning phase final results: geometric calibration and performances

机译：Sentinel-2A图像质量调试阶段的最终结果：几何校准和性能

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In the frame of the Copernicus program of the European Commission, Sentinel-2 offers multispectral high-spatial-resolution optical images over global terrestrial surfaces. In cooperation with ESA, the Centre National d'Etudes Spatiales (CNES) is in charge of the image quality of the project, and so ensures the CAL/VAL commissioning phase during the months following the launch. Sentinel-2 is a constellation of 2 satellites on a polar sun-synchronous orbit with a revisit time of 5 days (with both satellites), a high field of view - 290km, 13 spectral bands in visible and shortwave infrared, and high spatial resolution - 10m, 20m and 60m. The Sentinel-2 mission offers a global coverage over terrestrial surfaces. The satellites acquire systematically terrestrial surfaces under the same viewing conditions in order to have temporal images stacks. The first satellite was launched in June 2015. Following the launch, the CAL/VAL commissioning phase is then lasting during 6 months for geometrical calibration. This paper will point on observations and results seen on Sentinel-2 images during commissioning phase. It will provide explanations about Sentinel-2 products delivered with geometric corrections. This paper will detail calibration sites, and the methods used for geometrical parameters calibration and will present linked results. The following topics will be presented: viewing frames orientation assessment, focal plane mapping for all spectral bands, results on geolocation assessment, and multispectral registration. There is a systematic images recalibration over a same reference which is a set of S2 images produced during the 6 months of CAL/VAL. This set of images will be presented as well as the geolocation performance and the multitemporal performance after refining over this ground reference.
机译：在欧盟委员会哥白尼计划的框架内，Sentinel-2在全球地面上提供了多光谱的高空间分辨率光学图像。国家空间研究中心（CNES）与ESA合作，负责该项目的图像质量，从而确保在启动后的几个月内进行CAL / VAL调试阶段。 Sentinel-2是由两颗卫星组成的星座，位于太阳太阳同步轨道上，重访时间为5天（两颗卫星），视野高-290公里，可见光和短波红外13个光谱带，空间分辨率高-10m，20m和60m。 Sentinel-2任务对地面进行了全球覆盖。卫星在相同的观看条件下系统地获取地面，以获取时间图像堆栈。第一颗卫星于2015年6月发射。发射之后，CAL / VAL的调试阶段将持续6个月以进行几何校准。本文将指出调试阶段在Sentinel-2图像上看到的观察结果。它将提供有关带有几何校正功能的Sentinel-2产品的说明。本文将详细介绍校准位置以及用于几何参数校准的方法，并介绍相关结果。将提出以下主题：查看框架方向评估，所有光谱带的焦平面映射，地理位置评估的结果以及多光谱配准。在相同的参考上有系统的图像重新校准，这是在CAL / VAL的6个月中产生的一组S2图像。在此地面参考资料上进行细化后，将展示这组图像以及地理位置性能和多时相性能。

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