9
8
0
5
0
5
X 1981 SEASON
X 1982 SEASON
O 1983 SEASON
* O
sl I °
o I i 1 1 1 i I i I i I i l i I
170 180 200 220 240 260 280 300 320
JULIAN OATE
o.3h
X 1981 SEASON
x 1982 SEASON
O 1983 SEASON
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8
I
O
x*
-ojI i 1 1 i i i i 1
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JULIAN OATE
Figure 6. Temporal Plots of Vegetation Indices for
Wheat 1981, 1982, 1983.
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the influence of soil colour on spectral data is in
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It is also proposed to examine the scatter plots of
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the season in order to establish the boundaries of
'good' agricultural data as required by the Screen
algorithm (XSTAR) (Lambeck et al., 1978). The average
yellowness over the testsites which forms the basis of
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