Journal of Remote Sensing / 2022 / Article / Fig 2

Review Article

Satellite Remote Sensing of Savannas: Current Status and Emerging Opportunities

Figure 2

Overlap between global grasslands, savannas, forests, and drylands. The brown color shows the distribution of temperate, subtropical and tropical grasslands, savannas, and shrublands (referred to here collectively as “savannas”) in the Ecoregions 2017 dataset [33]. The distribution of forests (light blue color) is derived from the Global Ecological Zones (GEZ) dataset [34] and includes boreal, temperate, subtropical, and tropical forests. The dark blue color represents the apparent overlap between the Ecoregions 2017 and GEZ datasets, i.e., savannas and forests. The extent of drylands (dotted pattern) is based on the aridity index (AI) according to UNEP [35] where (i.e., including arid, semiarid, and dry subhumid ecosystems). The green dots represent examples of these ecosystems using imagery from Google Earth Pro: (a) Western shortgrass prairie, (b) Southeast US conifer savannas, (c) Eastern Anatolian steppe, (d) Daurian steppe, (e) Cape York Peninsula tropical savanna, (f) Central Zambezian wet Miombo, (g) Uruguayan savanna, and (h) Brazilian Cerrado.