GAEZ+_2015 Crop Yield

FAOSTAT yield data for all countries and crops, 2009-2100 and 2014-2016, are calculated from production and area, not directly reported yield values (http://www.fao.org/faostat/en/#data/QA). We computed the 2015 crop yield grids by doing a grid cell by grid cell division of crop production by crop harvested area, for all crops, both irrigated and rainfed. For each crop, m, and grid cell, k, crop yield in 2015 was computed as the ratio of crop production in 2015 to crop harvested area in 2015. Note that for many grid cells and many crops, the GAEZ+_2015 harvested area is zero. In these cases, the GAEZ+_2015 yield is reported as -3.39999999999999996e+38.

粮农组织统计数据库（FAOSTAT）产量数据集覆盖全球所有国家与各类作物，时间跨度涵盖2009-2100年与2014-2016年，该数据通过作物总产量与种植面积推算得到，而非直接上报的产量数值，数据来源为http://www.fao.org/faostat/en/#data/QA。本研究通过逐栅格单元将作物总产量除以作物收获面积的方法，构建了2015年作物产量栅格数据集，覆盖所有灌溉型与雨养型作物。针对每种作物m与每个栅格单元k，2015年的作物产量通过2015年作物总产量与2015年作物收获面积的比值计算得到。需注意，对于大量栅格单元与作物而言，GAEZ+_2015的作物收获面积为0。在此类情形下，GAEZ+_2015的作物产量将被记为-3.39999999999999996e+38。