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Progress in Earth and Planetary Science

Table 6 Definition of five phenological parameters

From: Creation and environmental applications of 15-year daily inundation and vegetation maps for Siberia by integrating satellite and meteorological datasets

Parameter

Meaning

Definition

D1

Start of spring (SOS)

DOY of maximum second derivative of NDVI fitting curve during spring season

D2

End of spring (EOS)

DOY of minimum second derivative of NDVI fitting curve during spring season

D3

Start of fall (SOF)

DOY of maximum second derivative of NDVI fitting curve during fall season

D4

End of fall (EOF)

DOY of minimum second derivative of NDVI fitting curve during fall season

D5

Peak of growing season

DOY of maximum NDVI in fitting curve

  1. Spring and fall seasons were roughly assumed from DOY = 100 to DOY = 180, and from DOY = 200 to DOY = 280, respectively, during which time the local extremum in the second derivative was searched for
  2. DOY: day of year, NDVI: normalized difference vegetation index
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