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With more than 4 TB of data acquired every day, the Sentinel 2 mission poses new challenges for quality control (QC). To support the QC operations of Sentinel 2, a dedicated tool has been developed for improved efficiency and traceability of analyses. This tool aims at helping visual inspection by human operators through automatic product retrieval, generation of quicklook images and production of quality indicators. The article describes the product sampling strategy used to select products suitable for quality control checks. Then we present the methodology used to generate quicklooks, compute relative and multi-spectral co-registration performance. The final step is the production of end-to-end service performance indicators. Lessons learnt from the first year of operation of this tool are presented regarding detected product anomalies and measured performance trends.

International audience; As part of the Copernicus programme of the European Commission (EC), the European Space Agency (ESA) operates the Sentinel-2 mission that acquires high spatial resolution optical imagery. The consistency of the image time series is ensured by some specific performance requirements such as multi-temporal spatial registration and radiometric stability, routinely monitored by the Sentinel-2 Mission Performance Centre (S2MPC). The products also provide a rich set of metadata and auxiliary data to support high-level processing activities. This presentation provides a description of the main level-1 products calibration and validation activities, performed by the S2MPC including several Expert Support Laboratories (ESL). Measured performances and analysed results show the good quality of the mission products both in terms of radiometry and geometry. The current performances for Sentinel-2A and Sentinel-2B are compared to mission product quality requirements.