Table 4 Percentage of RSEI grade in northern Anhui from 2001 to 2020.

From: Dynamic monitoring and analysis of factors influencing ecological environment quality in northern Anhui, China, based on the Google Earth Engine

Grade

Year

2001 (%)

2005 (%)

2010 (%)

2015 (%)

2020 (%)

Poor (0.0–0.2)

0.38

0.29

0.39

0.78

0.39

Fair (0.2–0.4)

3.74

7.79

4.83

8.16

3.81

Moderate (0.4–0.6)

14.88

59.93

63.43

31.16

42.77

Good (0.6–0.8)

68.41

29.46

27.96

49.21

46.13

Excellent (0.8–1.0)

12.59

2.53

3.39

10.69

6.9

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