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Fig. 3. Effect of different spatial aggregation techniques on the average yield variance (RVc, %/100) accounted for by the classification at Sites A (a and b, Clay Center) and B (c and d, Cairo). Left (a, c): Mean relative yield was first interpolated to maps of different grid cell size and then classified using hierarchical cluster analysis (WAR) or fuzzy-k-means clustering (FUZ). Right (b, d): Mean relative yield was interpolated to 4- by 4-m grid cell size and classified using WAR or FUZ, and the resulting yield classes were then spatially filtered using different window sizes ranging from 8 to 64 m.
