Gridded Livestock of the World (GLW)
FAO’s Animal Production and Health Division has, in collaboration with the Environmental Research Group Oxford (ERGO) developed the "Gridded Livestock of the World" (GLW). The GLW’s main objective is to produce and distribute contemporary global distribution maps for the main species of livestock. These maps are created through the spatial disaggregation of sub-national statistical data based on empirical relationships with environmental variables in similar agro-ecological zones. The data are produced in ESRI grid format at a spatial resolution of 3 minutes of arc (roughly 5 km at the equator) for cattle, buffalo, sheep, goats, pigs and poultry/chickens and are freely available for download via FAO’s GeoNetwork data repository. A publication is available that describes the datasets, methodology and selected applications in detail. Other data produced during the modelling process are the agro-ecological zones maps, used to define statistically homogeneous zones, and unsuitability masks for ruminant and monogastric species, used to exclude unsuitable areas prior to the modelling.