Define double logistics, piecewise logistics and many other functions to curve fit VI time-series
Logistic The traditional simplest logistic function. It can
be only used in half growing season, i.e. vegetation green-up or senescence
doubleLog.Zhang Piecewise logistics, (Zhang Xiaoyang, RSE, 2003).
doubleAG Asymmetric Gaussian.
doubleLog.Beck Beck logistics.
doubleLog.Gu Gu logistics.
doubleLog.Elmore Elmore logistics.
doubleLog.Klos Klos logistics.
1 2 3 4 5 6 7 8 9 10 11 12 13
A vector of parameters
All of those function have
formula attributes for the
convenience for analytical D1 and D2
Peter M. Atkinson, et al., 2012, RSE, 123:400-417
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