rcpp_season_filter

check_season_dt

check_season_list

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:
Kong, D., (2020). R package: A state-of-the-art Vegetation Phenology extraction
package, phenofit version 0.3.1, <doi:10.5281/zenodo.5150204>;
Kong, D., Zhang, Y., Wang, D., Chen, J., & Gu, X. (2020). Photoperiod Explains
the Asynchronization Between Vegetation Carbon Phenology and Vegetation Greenness
Phenology. Journal of Geophysical Research: Biogeosciences, 125(8), e2020JG005636.
<doi:10.1029/2020JG005636>;
Kong, D., Zhang, Y., Gu, X., & Wang, D. (2019). A robust method for reconstructing
global MODIS EVI time series on the Google Earth Engine.
ISPRS Journal of Photogrammetry and Remote Sensing, 155, 13–24;
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 (1982–2013).
Agric. For. Meteorol. 248, 408–417. <doi:10.1016/j.agrformet.2017.10.026>.

Dongdong Kong

phenofit

Extract Remote Sensing Vegetation Phenology

Mingzhong Xiao

Yongqiang Zhang

Xihui Gu

Jianjian Cui

rcpp_season_filter function

<dl><dt>d</dt>
<dd>Data.frame of growing season dividing info</dd>
<dt>rtrough_max</dt>
<dd><code>ytrough &lt;= rtrough_max*A</code>, A is the amplitude of y.</dd>
<dt>r_min</dt>
<dd>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.</dd>
<dt>dt</dt>
<dd>data.table of growing season division info</dd>
<dt>lst_dt</dt>
<dd>list of <code>dt</code>. Every year is corresponding to a <code>dt</code>.</dd></dl>

Arguments

season_filter — rcpp_season_filter

<dl>

<dt>d</dt>
<dd>Data.frame of growing season dividing info</dd>


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


<dt>r_min</dt>
<dd>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.</dd>


<dt>dt</dt>
<dd>data.table of growing season division info</dd>


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

</dl>

season_filter

rcpp_season_filter: season_filter

Description

Usage

Arguments