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Table 2 Relative RMSE and bias (in brackets) values of the forest attributes in three study stands

From: Inventory of aspen trees in spruce dominated stands in conservation area

Stand

Sampling rate (%)

Sampling alternative

Number of plots

RMSE (%) (bias %)

V

N

D g M

N dbh >25cm

1

2.48

Random

5

62.0 (–3.4)

64.3 (–5.0)

56.9 (–10.6)

81.8 (–2.4)

 

4.97

Random

10

43.8 (–3.3)

45.6 (–2.9)

35.2 (–6.0)

58.2 (–3.5)

 

7.45

Random

15

35.2 (0.6)

36.2 (0.2)

23.5 (–3.6)

47.7 (–0.5)

 

9.94

Random

20

30.5 (–1.4)

31.0 (–1.2)

15.5 (–2.1))

41.8 (–2.1)

  

Systematic

5

50.8 (–3.0)

56.0 (–4.4)

48.2 (–6.8)

74.3 (–1.2)

  

Systematic

10

34.5 (–0.1)

40.1 (–1.4)

35.8 (–6.1)

48.5 (0.1)

  

Systematic

15

25.9 (–2.3)

21.5 (–1.5)

17.8 (–1.8)

49.7 (–4.2)

  

Systematic

20

24.5 (–1.8)

25.5 (–1.2)

13.5 (–2.5)

38.5 (–2.8)

2

3.36

Random

5

85.7 (–0.2)

83.8 (0)

29.4 (1.3)

87.1 (–0.8)

 

6.72

Random

10

59.8 (1.2)

59.7 (0.6)

24.5 (–1.4)

60.6 (0.2)

 

10.08

Random

15

50.0 (–0.2)

49.2 (0)

21.1 (–1.3)

50.1 (–0.2)

 

13.45

Random

20

41.8 (0.7)

42.7 (–0.6)

18.7 (–0.4)

42.8 (–0.1)

  

Systematic

5

84.4 (–3.8)

98.2 (–8.2)

28.6 (0.9)

91.9 (–5.9)

  

Systematic

10

53.2 (0)

47.6 (–2.4)

23.6 (–0.6)

52.2 (–1.4)

  

Systematic

15

37.6 (1.4)

38.3 (–0.5)

18.5 (–0.3)

42.2 (0.5)

  

Systematic

20

30.6 (0.1)

31.1 (–0.6)

16.9 (–0.2)

34.6 (–0.3)

3

1.55

Random

5

51.1 (0.2)

64.5 (–0.5)

21.0 (0.5)

52.8 (–0.1)

 

3.09

Random

10

36.0 (–0.2)

46.3 (–1.8)

13.1 (0.5)

37.7 (–0.7)

 

4.64

Random

15

29.0 (–0.5)

37.3 (–1.0)

10.1 (–0.1)

30.1 (–0.5)

 

6.18

Random

20

25.2 (0.1)

31.7 (–0.8)

8.5 (0.1)

25.6 (0.2)

  

Systematic

5

53.6 (–1.2)

58.4 (2.9)

18.5 (0.5)

52.9 (–0.5)

  

Systematic

10

33.6 (–0.4)

35.5 (–0.7)

12.8 (–1.6)

36.4 (–0.6)

  

Systematic

15

26.7 (0)

29.8 (–0.7)

7.7 (–0.2)

24.2 (0)

  

Systematic

20

33.8 (0.1)

35.7 (0.4)

7.2 (–0.5)

31.9 (–0.2)