Figure 1From: Comparative analysis of remotely-sensed data products via ecological niche modeling of avian influenza case occurrences in Middle Eastern poultryDetail of the Nile Delta in January 2005, to illustrate patterns reflected in values of the three remotely sensed indices explored in this study. The gray scale illustrates gradients from low (white) to high (black) values of each index. (a) Enhanced Vegetation Index, (b) Leaf Surface Water Index, (c) Normalized Difference Vegetation Index.Back to article page