TrendText: Text of trends in time series
In greenbrown: Land Surface Phenology and Trend Analysis

Description Usage Arguments Details Value Author(s) See Also Examples

The function computes a trend in a time series and creates text strings of the estimated trend that ca be used in plots.

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TrendText(Yt, trend = TrendAAT, 
    period = NULL, unit = "unit", 
    per.year = FALSE)

`Yt`	a time series
`trend`	a function how the `trend` should be computed, e.g. `TrendAAT`, `TrendRQ`, `TrendSTM`
`period`	an additional sub-period of x for which trends should be additionally computed
`unit`	`unit` of the values in `Yt`
`per.year`	Is `unit` per year? If TRUE, `trend` is in % yr-2 !

This function is used in MtsPlot

A list with the estimated trends and with text.

Matthias Forkel <matthias.forkel@tu-dresden.de> [aut, cre]

MtsPlot

trd <- TrendText(ndvi, period=c(1982, 1996), unit="")
plot(ndvi)
lines(trd$trd1, col="red", lwd=2)
lines(trd$trd2, col="blue", lwd=2, lty=2)
text(2003, 0.19, trd$full.perc, col="red", cex=1.5) # full trend in %
text(2003, 0.36, trd$full.slope, col="red", cex=1.5) # full trend slope with unit
text(2003, 0.34, trd$full.slope2, col="red", cex=1.5) # full trend slope without unit
text(1988, 0.19, trd$subs.perc, col="blue", cex=1.5) # period: trend in %
text(1988, 0.36, trd$subs.slope, col="blue", cex=1.5) # period: trend slope with unit
text(1988, 0.34, trd$subs.slope2, col="blue", cex=1.5) # period: trend slope without unit