Validation/suivi de capteurs

monitoring

The validation of the sensor products, as well as a daily quality control, are required to get homogeneous and consistent temporal series (winds, waves and sea-ice). Inter-comparison with other sensors is necessary to fulfill this task. Thanks to the colocation system developped by the CERSAT, multi-sensors colocated datasets were generated to make easier intercomparison between various sensors and detection of possible sensor drifts. This section features :

  • long term statistical analyses of the measurements from various sensors,
  • comparisons and quality analyses of the data from various sensors,
  • ongoing monitoring of various sensors.

 

Most of the features presented here take advantage of the CERSAT colocated datsets which enable easier inter-comparison of different sensors. This topic aims to be an overview of the various works performed at CERSAT on this topic.

QuickSCAT backscatter

Only in english.

QuickSCAT winds

O nly in english.

QuickSCAT vs. Altimeters

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Comparison of QuikSCAT wind speed with TOPEX and ERS-2 altimeter wind speed : preliminary results.

The preliminary results presented in this topic were produced using the QuikSCAT colocated data, processed at CERSAT, with TOPEX/GDR products and with ERS-2/OPR products.They exhibits comparisons of QuikSCAT winds against TOPEX and ERS-2 altimeters, but also investigates impact of significant wave height on the difference between QuikSCAT and altimeter wind speed measurements.

Long-term wind/waves

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A long term validation of significant wave height (SWH) and wind speed measurements from altimeters and scatterometers is presented here. Simple statistics show that differences and trends exist among the altimeters, for both wind speed and SWH estimates. Origin of differences is calibration, processing changes along the satellite life, or electronics drift. Corrections are proposed for SWH, to be applied to the measurements before using such data, for climate investigation, for instance.