Harvested Area and Yields of 175 crops (M3-Crops Data)

• Monfreda et al. (2008), "Farming the planet: 2. Geographic distribution of crop areas, yields, physiological types, and net primary production in the year 2000", Global Biogeochemical Cycles, Vol.22, GB1022, doi:10.1029/2007GB002947

The data is provided in NetCDF and ArcGIS ASCII format at 5 minute resolution in latitude by longitude. The NetCDF files have 4 levels (ArcGIS files only have the 1st two levels; contact authors if you want the other two levels), as follows: Level 1 = Harvested Area (unit = proportion of grid cell area). Note that values can be greater than 1.0 because of multiple cropping. Level 2 = Yield (unit = tons per ha). Levels 3 and 4 = Administrative levels from which the source data in levels 1 and 2 come from respectively. In levels 3 and 4, a value of 1 = county; .75 = state; .5 = interpolated from within 2 degrees lat/long; .25 = country; 0 = missing
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• Weighted average
  This tool uses spatial data on precipitation, harvested area, yields, and prices to calculates country-level, production value-weighted averages of precipitation during globally defined growing seasons (Lobell and Field, 2007). Production values are obtained by multiplying maps on harvested area times yields times prices. The tool combines GIS and statistical software (GRASS and R).
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