Table 1 Statistics of biomass and six image features evaluated in the first alfalfa field.

From: Validation of UAV-based alfalfa biomass predictability using photogrammetry with fully automatic plot segmentation

Month

May

July

September

Replicate

1

2

3

1

2

3

1

2

3

Biomass (kg)

Avg

4.28

3.48

3.89

2.69

2.23

1.97

0.49

0.28

0.34

SD

0.58

0.55

0.62

0.91

0.74

0.77

0.35

0.11

0.15

Area pixels /100

Avg

46.29

43.91

44.73

38.41

34.76

35.22

17.18

15.65

15.65

SD

5.21

6.02

6.16

6.15

5.25

5.94

6.32

3.09

3.17

Plant Height (cm)

Avg

35.62

32.87

33.00

39.81

39.13

37.51

19.63

21.68

16.77

SD

6.83

6.31

5.82

6.84

5.83

5.39

6.46

7.58

4.25

NDVI × 100

Avg

37.39

38.09

42.22

40.60

39.08

41.19

27.61

28.01

27.05

SD

5.38

4.89

5.08

4.20

3.32

3.53

6.24

3.88

4.23

NDRE × 100

Avg

− 40.79

− 40.71

− 40.86

− 40.84

− 40.77

− 41.04

− 41.46

− 41.19

− 41.30

SD

0.50

0.48

0.50

0.48

0.47

0.43

0.53

0.48

0.54

NGRDI × 100

Avg

28.22

28.15

28.47

24.45

23.77

23.97

14.63

14.97

14.31

SD

1.08

1.20

1.20

1.58

1.52

1.74

2.64

1.55

1.66

  1. Values for observed biomass and each image feature are displayed as the plot average (Avg) and standard deviation (SD) for each combination of month and replicate.
Back to article page