新特性***** Earth Challenge *****As there is currently no remotely sensed global data set of the spatial distribution of world cereals, we are in partnership with the European Space Agency (ESA) and the Earth Challenge 2020 mobile application to address this key food security issue.Help to classify crops to allow for the production of a unique and massive global crop- type reference database of globally important crops e.g. wheat, maize, sunflower, greatly improving crop-type mapping.