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Figure 6. Experimental variograms of NDVI samples for area B on (a) 1996/11/08, (b) 1999/03/06, (c)
1999/10/31, (d) 2000/11/27, (e) 2001/11/20, (f) 2003/12/17, and (g) 2004/11/19.
Table 3 lists statistics for 100, 500, 1,000, and 3,000 samples from multiple NDVI
images with 62,500 grids using the cLHS approach. Figure 7 shows the 3,000 samples
selected using cLHS in each area. The distributions of selected samples confi rm that
samples selected using cLHS provide a good coverage of the study area and are well
spread and partially clustered in the study areas (Minasny and McBratney, 2006). The
statistics for these 3,000 samples indicate that the statistics obtained by cLHS can
 
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