[2] Toth G, Hermann T, Da Silva MR, et al. Environment International. 2016, 88: 299.
[3] Shi T, Wang J, Chen Y, et al. International Journal of Applied Earth Observation and Geoinformation, 2016, 52: 95.
[5] Liu M L, Wang T J, Skidmore A K, et al. Science of the Total Environment, 2018, 637: 18.
[9] Maisto G, Santorufo L, Arena C. Journal of Plant Nutrition and Soil Science, 2013, 176: 776.
[10] Frei M G, Osorio I. Proceedings of the Royal Society A-Mathematical Physical and Engineering Sciences, 2007, 463(2078): 321.
[14] Liu S, Liu X, Hou J, et al. Science in China Series E-Technological Sciences, 2008, 51: 202.
[15] Delegido J, Verrelst J, Alonso L, et al. Sensors, 2011, 11: 7063.