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fig. 4 Radiometric preprocessing 
CONCLUSION 
This paper describes shortly a methodology developped 
under a Contract of the National Research Council Space Plan 
which will be used in future SPOT and Thematic Mapper simulation 
programs. This procedure needs a significant improvement in ta- 
king into account the sensor technology and the atmospheric ef- 
fects, in particular in the case of multiplatforms observations 
with different sensors. Furthermore a deeper study and testing 
of the procedure is necessary contemporaneously with an applica- 
tion which will consider all the different aspects involved. 
This work will require at least a two years program which will 
start at the beginning of next autumn. 
29 
MD suras Eee LLL A