(3) On the basis of GAEZ potential yield observations, we calculated the Ricardian model's predictions about the pattern of production--which crops growers at different locations would choose to specialize in, at prevailing producer prices.
In a second recent paper, we again draw on the GAEZ data to measure some of the gains from agricultural trade.
This is feasible because the GAEZ project provides their agronomic predictions both for contemporary climate conditions and also under the expected climate conditions that correspond to each of the scenarios used by the UN's Intergovernmental Panel on Climate Change.
Compared with GAEZ, this study takes full advantage of observed climate data from meteorological stations.
The Center for Sustainability and the Global Environment (SAGE) at the University of Wisconsin derived six global LGPs by aggregating the IIASA/FAO GAEZ data into six categories of approximately 60 days per LGP: (1) LGP1: 059 days, (2) LGP2: 60-119 days, (3) LGP3: 120-179 days, (4) LGP4:180-239 days, (5) LGP5: 240-299 days, and (6) LGP6: more than 300 days .
 International Institute for Applied Systems Analysis and Food Agriculture Organization of the United Nations, Global Agro-Ecological Zones (GAEZ V3.