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Sentinel-2B Image Quality commissioning phase results and Sentinel2 constellation performances

机译：Sentinel-2B图像质量调试阶段的结果和Sentinel2星座性能

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In the frame of the Copernicus program of the European Commission, 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 and the second in March 2017. In cooperation with the European Space Agency (ESA), the French space agency (CNES) is in charge of the image quality of the project, and so ensured the CAL/VAL commissioning phase during the months following the launch. This cooperation is also extended to routine phase as CNES supports European Space Research Institute (ESRIN) and the Sentinel-2 Mission performance Centre (MPC) for validation in geometric and radiometric image quality aspects, and in Sentinel-2 Global Reference Image (GRI) geolocation performance assessment. This paper points on geometric image quality on Sentinel-2B commissioning phase. It relates to the methods and the performances obtained, as well as the comparison between S2A and S2B. This deals with geolocation and multispectral registration. A small focus is also done on the Sentinel-2 GRI which is a set of S2A images at 10m resolution covering the whole world with a good and consistent geolocation. This ground reference leads to ensure an accurate multi-temporal registration -on refined Sentinel-2 products over GRI- which is also presented in this paper.
机译：在欧盟委员会哥白尼计划的框架内，“前哨2号”是由两颗卫星组成的星座，在太阳同步的极地轨道上，重访时间为5天（两颗卫星），视野高-290 km，13可见光和短波红外光谱带，以及高空间分辨率-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，第二颗卫星于2017年3月发射。法国航天局（CNES）与欧洲航天局（ESA）合作负责该项目的图像质量，从而确保了CAL /发射后几个月内的VAL调试阶段。由于CNES支持欧洲空间研究所（ESRIN）和Sentinel-2飞行任务执行中心（MPC）进行几何和辐射图像质量方面的验证以及Sentinel-2全球参考图像（GRI）的验证，因此这种合作也扩展到了常规阶段。地理位置绩效评估。本文指出了Sentinel-2B调试阶段的几何图像质量。它涉及所获得的方法和性能，以及S2A和S2B之间的比较。这涉及地理定位和多光谱配准。 Sentinel-2 GRI也是一个小重点，它是一组10m分辨率的S2A图像，覆盖了整个世界，具有良好且一致的地理位置。此基础参考资料可确保在GRI上的精制Sentinel-2产品上实现准确的多时间配准，这也在本文中有所介绍。

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