The Influence of Spectral Pretreatment on the Selection of Representative Calibration Samples for Soil Organic Matter Estimation Using Vis-NIR Reflectance Spectroscopy. - Yi Liu 016; Yaolin Liu; Yiyun Chen; Yang Zhang 090; Tiezhu Shi; Junjie Wang 004; Yongsheng Hong; Teng Fei 001; Yang Zhang 025 (Remote. Sens., 2019)