Mapping Spatio-Temporal Variations of Converting Farmland to Forest/Grassland on the Loess Plateau Using All Available Landsat Time-Series Images. - Zhihui Wang 004; Peiqing Xiao; Pan Zhang; Weiying Sun; Li Li; Feifei Dong; Xinxin Hou; Li Ma; Chengran Jin (IGARSS, 2019)