Table 2 Meteorological indicators at different flight times on 26 August 2023.

From: Effects of solar elevation angle on the visible light vegetation index of a cotton field when extracted from the UAV

Project

Time

10:00

11:00

12:00

13:00

14:00

15:00

16:00

17:00

18:00

19:00

20:00

Wind direction

NW

NE

NE

NE

E

NE

N

N

N

N

NW

Wind speed(m/s)

0.5

1.8

1.5

1.8

2.7

0.7

0.8

1.2

3.0

2.2

1.7

Air pressure(Pa)

896

896

896

896

895

895

895

895

895

895

892

Air temperature(℃)

24.4

27.3

28.5

28.3

31.0

32.2

33.5

34.0

34.6

34.4

31.9

Air temperature(%)

52

39

33

25

22

33

45

38

29

25

27

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