For the global agro-ecological zones assessment GAEZ v3.0, time series data are used from the Climate Research Unit (CRU) at the University of East Anglia. Seven climatic variables are required for GAEZ climate analysis: mean 24 hour temperature, diurnal temperature range, sunshine fraction, wind speed, relative humidity, wet day frequency and precipitation. The precipitation data used was obtained from the German Weather Service (Global Precipitation Climatology Centre – GPCC) and the Johann Wolfgang Goethe-University Frankfurt (Institute for Atmosphere and Environment). [...]
Original monthly CRU 10 arc-minute and GPCC and CRU 30 arc-minute latitude/longitude climatic surfaces were interpolated to a 5 arc-minute grid for all years between 1961 to 2000 with a bilinear interpolation method. In case of temperatures a lapse rate was applied to calculate temperature values adjusted to sea level at original resolutions, followed by a bilinear interpolation to 5 arc-minute. Subsequently a lapse rate and a 5 arc-minute resolution DEM were used to calculate temperatures at actual elevations.