optim_pheno

A vector of initial values for the parameters for which optimal
values are to be found. <code>prior</code> is suggested giving a column name.

prior

The name of fine curve fitting functions, can be one of <code> 'FitAG', 'FitDL.Beck', 'FitDL.Elmore', 'FitDL.Gu' and 'FitDL.Klos', 'FitDL.Zhang'</code>.

sFUN

Numeric vector, vegetation index time-series

Numeric vector, <code>Date</code> variable

tout

The name of optimization method to solve fine fitting, passed
to <code><a rd-options="=I_optim" href="/link/I_optim()?package=phenofit&version=0.2.5-2&to=%3DI_optim" data-mini-rdoc="=I_optim::I_optim()">I_optim()</a></code> or <code><a rd-options="=I_optimx" href="/link/I_optimx()?package=phenofit&version=0.2.5-2&to=%3DI_optimx" data-mini-rdoc="=I_optimx::I_optimx()">I_optimx()</a></code>.
<code>I_optim</code> supports <code>'BFGS','CG','Nelder-Mead', 'L-BFGS-B', 'nlm', 'nlminb', 'ucminf'</code>;
<code>I_optimx</code> supports <code>'spg','Rcgmin','Rvmmin', 'newuoa','bobyqa','nmkb','hjkb'</code>.

method

(optional) Numeric vector, weights of <code>y</code>. If not specified,
weights of all <code>NA</code> values will be <code>wmin</code>, the others will be 1.0.

Integer, number of images per year, passed to <code>wFUN</code>.
Only <code><a rd-options="=wTSM" href="/link/wTSM()?package=phenofit&version=0.2.5-2&to=%3DwTSM" data-mini-rdoc="=wTSM::wTSM()">wTSM()</a></code> needs <code>nptperyear</code>. If not specified,
<code>nptperyear</code> will be calculated based on <code>t</code>.

nptperyear

<code>ymin, ymax</code>, which is used to force <code>ypred</code> in the
range of <code>ylu</code>.

How many times curve fitting is implemented.

iters

weights updating function, can be one of 'wTSM', 'wChen' and
'wBisquare'.

wFUN

Whether to display intermediate variables?

verbose

other parameters passed to <code><a rd-options="=I_optim" href="/link/I_optim()?package=phenofit&version=0.2.5-2&to=%3DI_optim" data-mini-rdoc="=I_optim::I_optim()">I_optim()</a></code> or <code><a rd-options="=I_optimx" href="/link/I_optimx()?package=phenofit&version=0.2.5-2&to=%3DI_optimx" data-mini-rdoc="=I_optimx::I_optimx()">I_optimx()</a></code>.

Interface of optimization functions for double logistics and other parametric
curve fitting functions.

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>.

Dongdong Kong

phenofit

Extract Remote Sensing Vegetation Phenology

Jianjian Cui

Mingzhong Xiao

Yongqiang Zhang

Xihui Gu

optim_pheno function

The name of optimization method to solve fine fitting, passed
to <code><a rd-options='=I_optim' href='I_optim()'>I_optim()</a></code> or <code><a rd-options='=I_optimx' href='I_optimx()'>I_optimx()</a></code>.
<code>I_optim</code> supports <code>'BFGS','CG','Nelder-Mead', 'L-BFGS-B', 'nlm', 'nlminb', 'ucminf'</code>;
<code>I_optimx</code> supports <code>'spg','Rcgmin','Rvmmin', 'newuoa','bobyqa','nmkb','hjkb'</code>.

Integer, number of images per year, passed to <code>wFUN</code>.
Only <code><a rd-options='=wTSM' href='wTSM()'>wTSM()</a></code> needs <code>nptperyear</code>. If not specified,
<code>nptperyear</code> will be calculated based on <code>t</code>.

other parameters passed to <code><a rd-options='=I_optim' href='I_optim()'>I_optim()</a></code> or <code><a rd-options='=I_optimx' href='I_optimx()'>I_optimx()</a></code>.

optim_pheno: optim_pheno

Description

Usage

Arguments

Value