Greenup dates detected from (a) VENμ
S (modified from Gao et al. [35
]), (b) Sentinel-2 (modified from Gao et al. [41
]), and (c) PlanetScope time series over the Beltsville Agricultural Research Center (BARC) experimental fields in Beltsville, Maryland, USA, during the 2019 growing season. Satellite acquisitions from January 1, 2019, to July 27, 2019, were used to detect the most recent greenup events.