Fig. 1. Flow chart of experimental design

Fig. 2. Experimental layout

Fig. 3. Experimental equipment. (a) DJI UAV equipped with spectrometer; (b) imaging spectrometer

Fig. 4. Original spectral curves. (a) Green wooden boards and green steel plates; (b) silver-white wooden model and silver-white iron model; (c) green plastic lawn and green real lawn

Fig. 5. Spectral curves after envelope removal. (a) Green wooden boards and green steel plates; (b) silver-white wooden model and silver-white iron model; (c) green plastic lawn and green real lawn