[process] MapSPAM Select Protected Areas

"We select the protected area (Protect) from the World Database on Protected Areas (WDPA), released by the International Union for Conservation of Nature (Deguignet et al., 2014), as an allocation parameter to indicate the locations where crop production is least likely to take place."
Yu, Qiangyi; You, Liangzhi; Wood-Sichra, Ulrike; Ru, Yating; Joglekar, Alison K. B.; Fritz, Steffen et al. (2020): A cultivated planet in 2010 – Part 2: The global gridded agricultural-production maps. In: Earth Syst. Sci. Data 12 (4), S. 3545–3572. DOI: 10.5194/essd-12-3545-2020.