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Instruments calibration and data quality monitoring

Calval (CALibration / VALidation) is what determines data quality. This step involves a series of quality controls designed to ensure a continuous supply of data.

Calval teams calibrate the satellite instruments and determine the parameters, corrections, bias and so on to be applied to measurements. In particular, this task involves validating and refining algorithms in close collaboration with processing system development teams and users.

Once the mission is fully under way, routine Calval operations consist in determining data quality and keeping a check on instrument drift. Quality control is achieved through statistical data analysis, analyses at crossover points, and comparisons between orbit cycles. Data are also compared with other missions and with in situ sites and networks.


Cyclic reports

Annual reports

Annual reports of validation activities in 2017:

Annual reports of validation activities in 2016:

Annual reports of validation activities in 2015:

Annual reports of validation activities in 2014: 

HY-2A technical note describing improvement performed to enhance S-IGDR products and analyzing the global quality of RS-IGDR products:

The reports of the validation activities for the year 2013-2014 are available here:

The results obtained in the frame of the validation activities for year 2012 are summarized here:

The results obtained in the frame of the validation activities for year 2011 data are summarized here:




Calval Plans

  • Saral/AltiKa Joint Calval Plan (pdf): This is the plan objective for Saral satellite during and beyond the calibration/validation phase, conducted by the two partners Cnes and Isro project teams.

In situ comparisons

  • dedicated sites and campaigns
  • global analysis (comparison with tide gauge network)

Other calval activities:

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