These groups emerged after an analysis of available sta
tistic data in the zone. On an average they account 99$ of the
coverage of the three areas and supply therefore very reliable
data. Maps of soil use, scale 1:50,000 were produced for each
of the areas .
After using the group classification given above an
inventory of the specified crops was drawn up in order to test
the method adopted and the results obtained: the test was a
comparison with the data in the hands of the Regional Authori
ties; the results are given in the conclusions. At the moment
the Landsat data is being analyzed by checking the results
obtained using an automatic interpretation procedure on the
computer.
Methodology used
The methodology is based on the use of scenes supplied by
the Landsat satellites 1 and 2 integrated with black and white
aerial photographs taken at about 2,000 metres.
The optimum employment of Landsat data in identifying single
categories is conditioned by the fact that the signatures of the
various agricultural species are approximately equal if monito
red at the same stage of development ((A)) and ((B)), whereas
the signature of single agricultural species varies widely
during growth so it can be distinguished from the others over
a period of time.
If one is to distinguish between the species accurately
one must establish the periods when growth stages of each species
differ from one another. The phenological progression of the
crops under examination must therefore be known ((C)).
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