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1 7 
ind 5 
One should note that in most cases a signature map like 
the one mentioned above can be obtained using only channels 
6 and 7. These contain 70%,80% of the information acquired. 
By adding the rest of channels 4 and 5 the remaining 202,308 
of the information is included, thus reinforcing and perfecting 
the conclusions reached. Though only of slight interest here 
one should note that the inversion of channels 4 and 5 
"depresses" the signatures of shores,sand,quarries etc. which 
is of further assistance in eliminating them. 
By following this methodology three signature maps were 
obtained, one each for the data of the three Landsat scenes: 
the first (19 March 1976) shows the average presence of wheat, 
small grains(barley,rye and oats),forage crops in grass fields, 
meadows and meadows alternating clover,alfalfa and similar 
crops. 
According to the phenological calendar the second(3 May 
1976) should have brought out the harvest of non-grain cultivated 
species; what emerged instead was a further small expansion of 
the surfaces of the species mentioned above; this showed that 
at the date of the previous scene some of the species had not 
reached full ripening: they had reached the period immediately 
prior to cutting and thus showed a delay as regards the pheno_ 
logical calendar forecasted. 
The third(8 June 1976) showed the effect of harvesting grass 
fields and meadows and was used to indicate the presence of 
cereals(wheat,barley and similar),see figures (10) and (11). 
In area no.01 alone, rice was identified in the May 3 
scene,as at this date it was under water and fully visible in 
channel 7 (see figure (09)).