Fig. 1: Map of in situ ET measurement sites.

Map of the locations of in situ ET stations used to evaluate OpenET, including their general land cover type and Köppen–Geiger (KG) climate zones34. White areas represent climate zones that did not contain any cropland sites and were excluded from the analysis. Climate zone abbreviations are defined as follows: cold and hot semi-arid steppe (Bsk + Bsh); hot and cold desert (Bwh + Bwk); humid subtropical (Cfa); hot- and warm-summer Mediterranean (Csa + Csb); and hot- and warm-summer humid continental (Dfa + Dfb).