MI 
more use as the data would lead to more tightly confined clusters. Note that this says nothing about whether the 
crop clusters would be superimposed. A sensor with a different incidence angle may improve this situation by 
separating some crops but could also merge others. It appears likely that there are optimum incidence angles for 
different tasks in agricultural imaging. Note also that these comments refer only to single date imagery and that 
the inclusion of other times during the growing season may play an important role as we have seen with ERS-1 
observations (Wright et al 1994). 
6 - ACKNOWLEDGEMENTS 
We would like to thank NASA, the European Space Agency and the Joint Research Centre, Ispra for their roles 
in organising and conducting the MAC Europe experiment. This work was supported by the British National 
Space Centre under contract RAE IB / 89 
7 - REFERENCES 
Bird, P.J., Cordey, R.A., Diament, A, Gorman, M.R., Holmes, M.G., Kenward, D.R.D., Keyte, G.E., 
Wooding, M. & Wright P.A., 1993. ERS-1 SAR Crop Monitoring Experiment in East Anglia, UK. 
Proceedings of First ERS-1 Symposium, Cannes, France, 4-6 November 1992, ESA SP-359 
Cordey, R.A., Wright, P.A., Quegan S., Wielogorska, A. & Loughlin, W.P. 1993. MAC-EUROPE Crop 
Imaging Experiment at Feltwell, UK. Proceedings of 25 th International Symposium, Remote Sensing and 
Global Environmental Change, Graz, Austria, 4-8 April 1993 
Tsang, L., Kong, J.A. & Shin, R.T., 1985. Theory of Microwave Remote Sensing. J. Wiley & Sons, New 
York 
Wright, P.A., Saich, P.J & Cordey, R.A., 1994. Crop Monitoring with ERS-1 SAR in East Anglia, UK. 
Proceedings of Second ERS-1 Symposium, Hamburg, Germany, 11-14 October 1993, to be published. 
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