[dataset] MapSPAM Harvested Area [Draft]

Measured in hectares, harvested area is at least as large as physical area but sometimes more since it also accounts for multiple harvests of a crop on the same plot. Like for physical area, the harvested area is calculated for each production system, and the sum of all harvested areas of all production systems in a pixel amounts to the total harvested area of the pixel. The sum of all the harvested areas of the crops in a pixel can be larger than the pixel size.