[1] [1] Shardendu Kumar Singh, James H Houx, Michael J W, et al. Field Crops Research, 2017, 209: 47.

[2] [2] Li Dong, Cheng Tao, Zhou Kai, et al. ISPRS Journal of Photogrammetry and Remote Sensing, 2017, 129: 103.

[3] [3] Tan Kezhu, Wang Shuwen, Song Yuzhu, et al. Chemometrics and Intelligent Laboratory Systems, 2018, 172: 68.

[4] [4] Cao Q, Miao Y, Li F, et al. Precision Agriculture, 2016, 18(1): 1.

[5] [5] Zhao B, Duan A W, Syed T A, et al. European Journal of Agronomy, 2018, 94: 113.

[6] [6] Li Fei, Bodo Mistele, Hu Yuncai, et al. European Journal of Agronomy, 2014, 52: 198.

[7] [7] Li F, Miao Y X, Feng G H, et al. Field Crops Research, 2014, 157: 111.

[8] [8] Gnyp M L, Miao Y X, Yuan F, et al. Field Crops Research, 2014, 155: 42.

[9] [9] Asa G, Jan M, Veronika K M, et al. Forests, 2016, 7(10): 226.

[10] [10] Jesús Delegido, Luis Alonso, Gonzalo González, et al. International Journal of Applied Earth Observation and Geoinformation, 2010, 12(3): 165.

[12] [12] Wang Junjie, Wang Tiejun, Shi Tiezhu, et al. Remote Sensing, 2015, 7(11): 15340.