check_season

check_season_dt

cheak_season_list

Data.frame of growing season dividing info

<code>ytrough &lt;= rtrough_max*A</code>, A is the amplitude of y.

rtrough_max

Threshold is defined as the difference of peak value with
trough value. There are two threshold (left and right). The minimum threshold
should be greater than r_min.

r_min

data.table of growing season dividing info

the minimum and maximum length (in the unit of days)
of growing season

len_min

len_max

list of <code>dt</code>. Every year is corresponding to a <code>dt</code>.

lst_dt

internal

The merits of 'TIMESAT' and 'phenopix' are adopted. Besides, a simple and
growing season dividing method and a practical snow elimination method
based on Whittaker were proposed. 7 curve fitting methods and 4 phenology
extraction methods were provided. Parameters boundary are considered for
every curve fitting methods according to their ecological meaning.
And 'optimx' is used to select best optimization method for different
curve fitting methods.
Reference:
Dongdong Kong, R package: A state-of-the-art Vegetation Phenology extraction package,
phenofit version 0.2.3, <https://github.com/kongdd/phenofit>;
Zhang, Q., Kong, D., Shi, P., Singh, V.P., Sun, P., 2018. Vegetation phenology
on the Qinghai-Tibetan Plateau and its response to climate change (1982<e2><80><93>2013).
Agric. For. Meteorol. 248, 408<e2><80><93>417. <doi:10.1016/j.agrformet.2017.10.026>.

check_season: check_season

Description

Usage

Arguments