Sentinel-5P Cal/Val activities are essential to the quality of the mission. Data quality is assessed through determination of the radiometric, spatial, spectral and geometric fidelity of the satellite sensor and the accuracy of geophysical products.

Sentinel-5P Cal/Val activities are essential to the quality of the mission. Data quality is assessed through determination of the radiometric, spatial, spectral and geometric fidelity of the satellite sensor and the accuracy of geophysical products.

• Calibration: calibration approach information and links to web portals used to monitor the Sentinel-5P calibration are available learn more on the calibration page .
• Validation: Information on the routine validation approach and links to web portals used to monitor the Sentinel-5P validation are available learn more on the validation page
• Validation Campaigns:Information on Sentinel-5P validation campaigns is available learn more on the Sentinel-5 Precursor Campaigns website.

  While the routine validation of atmospheric composition products is secured by operational quality control centres such as the Mission Performance Centre supported through independent validation teams, the correlative data used is usually restricted to specific products and observation techniques. These activities, therefore, do not cover insight into the instrument performance, the products quality and potential dependencies for all possible measurement scenarios. Therefore there is a need to provide additional validation of different Sentinel-5P products via dedicated validation campaigns.

In addition, and before given products are released to the user community, validation workshops are held with the aim of presenting Calibration/Validation (Cal/Val) results on those S5p products. These results are used to assess the uncertainty of the target S5p products and to decide about their release to the public. The workshops that have been held so far are:

• S5p First products release workshop (physical meeting), 25-26 June 2018: aiming at presenting first Calibration/Validation (Cal/Val) results for Level 1b products and a subset of the Level 2 products (Total Columns of Ozone, Nitrogen Dioxide and Carbon Monoxide; Cloud & Aerosol information).
• S5p Second products release workshop (teleconference), 28 September 2018: aiming at presenting first Calibration/Validation (Cal/Val) results for Total Columns of Ozone – OFFL, Tropospheric Ozone - OFFL, Formaldehyde and Sulphur Dioxide – NRT & OFFL.
• S5p Third products release workshop (teleconference), 20 February 2019: aiming at presenting Calibration/Validation (Cal/Val) results for Total Columns of Ozone – OFFL and Methane - OFFL.