Preparation of the variable database. Datasets obtained from various sources (such as the Food and Agriculture Organization of the United Nations (FAO) , GBIF  and WRI ) were mapped to a common structure. Derived variables were treated as new variables. Time series of datasets were retained, but only the latest available data were used for the working database. DB: Database; recs: records; vars, variables.
Ariño et al. BMC Bioinformatics 2011 12(Suppl 15):S4 doi:10.1186/1471-2105-12-S15-S4