9 
8 
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5 
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X 1981 SEASON 
X 1982 SEASON 
O 1983 SEASON 
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170 180 200 220 240 260 280 300 320 
JULIAN OATE 
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X 1981 SEASON 
x 1982 SEASON 
O 1983 SEASON 
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JULIAN OATE 
Figure 6. Temporal Plots of Vegetation Indices for 
Wheat 1981, 1982, 1983. 
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Malan, O.G. and B. Turner 1984. Mapping of winter 
crops on the South African Highveld. Advances in 
Space Research. 4(11):169-172. 
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Pearson, R.L. and L.D. Miller 1972. Remote mapping 
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ductivity of the shortgrass prairie. 8th Interna 
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University of Michigan, Ann Arbor. 
Rice, D.P. and W.A. Malila 1983. Investigation of 
radiometric properties of LANDSAT 4 multispectral 
scanner, NASA CR-ERIM 163200-3-F. 
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Photogrammetric Engineering and Remote Sensing. 
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the influence of soil colour on spectral data is in 
progress. 
It is also proposed to examine the scatter plots of 
MSS data of the nine test sites for dates throughout 
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 
the XSTAR haze correction algorithm will be investi 
gated. 
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