1 / 8

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

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.

sharonhjones
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related