Plate 60 - Potential distribution of rain-fed wheat at +1.C annual temperature
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For each of the approximately 2.2 million grid-cells of the database suitability results were calculated. The outcomes were mapped by means of a suitability index (SI). This index reflects the suitability make-up of a particular grid-cell. In this index VS represents the portion of the grid-cell with attainable yields that are 80% or more of the maximum potential yield. Similarly, S, MS and mS represent portions of the grid-cell with attainable yields 60%-80%, 40%-60%, and 20%-40% of the maximum potential yield, respectively. SI is calculated using the following equation: SI = VS*0.9 + S*0.7 + MS*0.5 + mS*0.3.