A robust spectral angle index for remotely assessing soybean canopy chlorophyll content in different growing stages

Table 1 The parameters of the unmanned aerial vehicle (UAV), UHD 185 hyperspectral imaging sensor, and FieldSpec 3 field spectrometer that were used in this study

UAV		Sensors and parameters
UAV		Types	UHD185^a	FieldSpec 3^b
Name	DJI S-1000	Field of view	19°	25°
Flying height	50 m	Working height	50 m above ground	0.5 m above canopy
Flying speed	About 8 m/s	Spectral information	450–950 nm	350–2500 nm
Takeoff weight	6–11 kg	Original spectral resolution	8 nm @ 532 nm	3 nm @ 700 nm; 8.5 nm @ 1400 nm; 6.5 nm @ 2100 nm
Working time	About 30 min	Data spectral resolution	4 nm	1 nm

ISSN: 1746-4811