PhenoTrs: Phenology extraction in Threshold method (TRS)

In phenofit: Extract Remote Sensing Vegetation Phenology

Phenology extraction in Threshold method (TRS)

Description

Phenology extraction in Threshold method (TRS)

Usage

PhenoTrs(
  x,
  t = NULL,
  approach = c("White", "Trs"),
  trs = 0.5,
  asymmetric = TRUE,
  IsPlot = TRUE,
  ...
)

## S3 method for class 'fFIT'
PhenoTrs(x, t = NULL, ...)

## Default S3 method:
PhenoTrs(
  x,
  t = NULL,
  approach = c("White", "Trs"),
  trs = 0.5,
  asymmetric = TRUE,
  IsPlot = TRUE,
  ...
)

Arguments

x	numeric vector, or fFIT object returned by curvefit().
t	doy vector, corresponding doy of vegetation index.
approach	to be used to calculate phenology metrics. 'White' (White et al. 1997) or 'Trs' for simple threshold.
trs	threshold to be used for approach "Trs", in (0, 1).
asymmetric	If true, background value in spring season and autumn season is regarded as different.
IsPlot	whether to plot?
...	other parameters to PhenoPlot

See Also

PhenoDeriv(), PhenoGu(), PhenoKl()

Examples

# `doubleLog.Beck` simulate vegetation time-series
t    <- seq(1, 365, 8)
tout <- seq(1, 365, 1)
par  = c( mn  = 0.1 , mx  = 0.7 , sos = 50 , rsp = 0.1 , eos = 250, rau = 0.1)
y <- doubleLog.Beck(par, t)

methods <- c("AG", "Beck", "Elmore", "Gu", "Zhang") # "Klos" too slow
fit <- curvefit(y, t, tout, methods)
x <- fit$model$AG # one model

par(mfrow = c(2, 2))
PhenoTrs(x)
PhenoDeriv(x)
PhenoGu(x)
PhenoKl(x)

phenofit documentation built on June 8, 2025, 9:39 p.m.