Full text: Mesures physiques et signatures en télédétection

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7- CONCLUSION 
In this study, we have proposed a new algorithm to estimate die columnar water vapour content from ATSR/IR 
Split-Window channels. The simultaneous measurements of die ATSR/MW radiometer permit us to fit the 
algorithm over oceans areas. The algorithm has then been validated on a dataset containing 35 ATSR images. 
The application show a good agreement between the infrared methodology and the microwave 
measurement with standard deviation less than 0.4 g/cm 2 - This work has now to be pursued at a global scale on 
a larger dataset to test the effects of the local conditions : atmospheric temperature, surface wind speed 
influencing the surface emissivity, for example. Then, it may be applied over land where the surface 
emissivity effects should be carefully analysed. 
In conclusion, diese very preliminary results show that die Split-Window transmittance ratio technique 
seems very promising to estimate the total précipitable water with ATSR/IR data, and that the accuracy 
obtained is sufficient to improve the Split-Window algorithms for surface temperature determination. 
Acknowledgements 
The authors would like to thank D. Vidal-Madjar for fruitful discussions and also all the members of 
the RAL team who provided us with the ATSR data. This work has been supported by CNRS and ESA. 
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