Fig. 1. Schematic diagram of shooting scene

Fig. 2. Geometry diagram of the experiment (Solar elevation angle is 43°)

Fig. 3. Spectral curves of four research objects under different solar altitudes
(a): Spectral curves of green vegetation; (b): Spectral curves of camouflage rain coats;(c): Spectral curve of light green camouflage board; (d): Spectral curve of dark green camouflage board

Fig. 4. Spectral curves of three research objects under different azimuths
(a): Spectral curves of green vegetation; (b): Spectral curves of camouflage rain coats;(c): Spectral curve of light green camouflage board; (d): Spectral curve of dark green camouflage board

Fig. 5. Spectral curves of three types of objects under different detection angles
(a): The spectral curve of green vegetation;(b): The spectral curve oflight camouflage board;(c): The spectral curve of camouflage raincoat

Fig. 6. BRDF parameters of greenbelt vegetation and camouflage board
(a): Green vegetation parameter value;(b): Model Parameter values of camouflage board