Table 3 Regional average value and their corresponding duration of weekly VHI at different ranges for the period of 1982–2016 in Jing-Jin-Ji region.

From: Assessment of vegetation growth and drought conditions using satellite-based vegetation health indices in Jing-Jin-Ji region of China

Category

VHI range

Average value

Duration(weeks)

D4

VHI < 5

2.01

14

D3-D4

VHI < 15

9.06

57

D2-D4

VHI < 25

16.88

174

D1-D4

VHI < 35

24.59

398

Stress

VHI < 40

28.24

552

Normal

40 < VHI < 60

49.92

728

Favorable

VHI > 60

71.33

492

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