FIGURE 9.4: Weighted normalized difference vegetation index (NDVI) data plotted against time and latitude zone. Note the highly seasonal effects in the northern latitudes, the influence of deserts in the 20°-30° N latitude zone, the generally constant response in equatorial areas, and the influence of the low proportion of land area south of 30° S.

SOURCE: J. E. Pinzon (SSAI-NASA/GSFC) and C. J. Tucker (NASA/GSFC).