Description Usage Arguments Details Value Note References
Calculate backgroud values for vegetation index.
1 |
y |
Numeric vector, vegetation index time-series |
t |
Numeric vector, |
w |
(optional) Numeric vector, weights of |
Tn |
Numeric vector, night temperature, default is null. If provided,
Tn is used to help divide ungrowing period, and then get background value in
ungrowing season (see details in |
minT |
min temperature for growing season. |
nptperyear |
Integer, number of images per year. |
... |
Others will be ignored. |
Night temperature Tn >= Tmin (default 5 degree) defined as raw growing season. Background value is determined from two neighboring vegetation in raw growing season by assuming that the background and vegetation abundance could remain the same during a consecutive two yearperiod. Details can be seen in Zhang et al., (2015).
back If back value is NA, it is impossible to extract phenology here.
This function only works in every growing season.
Zhang, X., 2015. Reconstruction of a complete global time series of daily
vegetation index trajectory from long-term AVHRR data. Remote Sens. Environ.
156, 457–472. https://doi.org/10.1016/j.rse.2014.10.012.
Zhang, Y., Xiao, X., Jin, C., Dong, J., Zhou, S., Wagle, P., Joiner, J., Guanter, L., Zhang, Y., Zhang, G., Qin, Y., Wang, J., Moore, B., 2016. Consistency between sun-induced chlorophyll fluorescence and gross primary production of vegetation in North America. Remote Sens. Environ. 183, 154–169. https://doi.org/10.1016/j.rse.2016.05.015.
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