Symposi 
Identif 
P.Hoogebi 
Physics and 
ABSTRACT: I 
classificat 
simultaneou 
goal is to 
Therefore t 
duced. Very 
incidence a 
1 INTRODUCT 
In this pap 
follow-on s 
(Refs. 1, 3 
national re; 
ture and fo 
Observation 
institutes 
The tests 
situated in 
Figure 1 sh< 
testarea. T1 
of which 16* 
type known, 
crop types : 
sugarbeets 
also import« 
and therefoi 
most occurii 
classifier. 
Figure 1. Ma 
indicated (n 
area of 35 x 
km.