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1 st Envisat Validation Workshop MERIS, December 2002 Conclusions and Recommendations

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sharonhjones
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This report summarizes the conclusions and recommendations from the Envisat Validation Workshop for the MERIS instrument. It covers topics such as calibration, in-flight verification, validation, and the performance of the instrument. The report also highlights the need for further data analysis and improvements in spectral characterization, degradation modeling, and radiative transfer codes.

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1 st Envisat Validation Workshop MERIS, December 2002 Conclusions and Recommendations
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  1. 1st Envisat Validation Workshop MERIS, December 2002 Conclusions and Recommendations

  2. Plan Introduction Calibration In-flight Vicarious Verification Validation Cloud and Water Vapour Land Products Water Products Conclusion

  3. Introduction • Instrument works very well. • In-flight radiometric and spectral calibration performed regularly. Spectral calibration campaigns took place giving an in-flight spectral characterization results with unprecedented accuracy. • Verification activity was more demanding than originally expected but produced good results. • Following the verification phase, the vicarious calibration and the validation activities started. • First results have been presented during the workshop.

  4. Calibration Team Conclusions • Second spectral campaigns confirm early results. • - Overall accuracy 0.2 nm, resolution 0.05 nm • Radiometric calibration results showed only a little degradation in some of the cameras since launch (below 2.5%) • Vicarious calibration results (based on field measurements) showed good agreement (within the accuracy of the method used). • Inter comparison with AATSR showed good agreements. • Inter comparison results over desert sites showed an over estimation of Meris compared to last century’s sensors.

  5. Calibration Team Recommendations • Spectral characterization • Repeat spectral characterization campaigns every six months • Improve the instrument model using calibrated data • Instrument Degradation: • Include a pixel-wise degradation model in the L1b processing • Run a diffuser ageing calibration in SciLo configuration (planned) • BRDF modelling • Improve the BRDF model based on in-flight data • Develop a diffuser degradation model • Study the Speckle effect • Run a vigneting check for diffuser illumination extremes (planned)

  6. Calibration Team Recommendations • Radiative Transfer Codes • Inter-compare the Radiative Transfer Codes used for Vicarious Calibration • Tool Box Improvements • Include a L1b conversion to TOA reflectance & TOA normalized radiance • Include the RTC in the Toolbox for vicarious calibration exercises • METRIC Improvements • Include Snow, Buoys, instrumented site extraction • Include IOCCG Diagnostic data sites extraction • Calibration Plan • Systematic acquisition of data over designated targets and distribution via FTP • Hold Regular Cal/Val workshops

  7. Calibration Team Recommendations • Exploitation of available spectral campaign data • SeaWiFs, Chris/Proba • Programming of new spectral campaigns for radiometric calibration • Spot/Vegetation, ATM, MODIS, GLI, AATSR • Calibration Plan • Systematic comparison of MERIS and AATSR based on macro-pixels • Systematic acquisition of data over designated targets and distribution via FTP • Hold Regular Cal/Val workshops

  8. Conclusion • MERIS instrument is in very good shape and performs beyond spec. • The validation has started, however,more match up data are needed to conclude on the achieved accuracy. • More time is needed to look at the data and make a complete synthesis. • The first results look very promising (as per December 2002). • The products are now being distributed following smile correction update. • MERIS Image Data can be viewed through the Envisat homepage • http://envisat.esa.int and through the Multimedia Gallery from ESA’s homepage: www.esa.int