The sets of experimental relevant images for each land cover category are identified with the
help of the experts in remote sensing. For example, Fig. 16 shows the patterns (agricultural lands
around the Missouri River) that are relevant to the query pattern of Fig. 12 (a). Fig. 17 shows the
coverage and novelty ratios under different categories. Note that the performance depends much
on the specific categories used in this study. Although on average, both the coverage and the
novelty ratios are less than 50%, we believe that an appropriate category division can help to
improve the overall performance of the system