oce (version 1.8-1)

predict.tidem: Predict a Tidal Signal

Description

This creates a time-series of predicted tides, based on a tidal model object that was created by as.tidem() or tidem().

Usage

# S3 method for tidem
predict(object, newdata, ...)

Value

A vector of predictions.

Arguments

object

a tidem object.

newdata

vector of POSIXt times at which to make the prediction. For models created with tidem(), the newdata argument is optional, and if it is not provided, then the predictions are at the observation times given to tidem(). However, newdata is required if as.tidem() had been used to create object.

...

optional arguments passed on to children.

Author

Dan Kelley

See Also

Other things related to tides: [[,tidem-method, [[<-,tidem-method, as.tidem(), plot,tidem-method, summary,tidem-method, tidalCurrent, tidedata, tidem-class, tidemAstron(), tidemVuf(), tidem, webtide()

Examples

if (FALSE) {
library(oce)
# 1. tidal anomaly
data(sealevelTuktoyaktuk)
time <- sealevelTuktoyaktuk[["time"]]
elevation <- sealevelTuktoyaktuk[["elevation"]]
oce.plot.ts(time, elevation, type='l', ylab="Height [m]", ylim=c(-2, 6))
tide <- tidem(sealevelTuktoyaktuk)
lines(time, elevation - predict(tide), col="red")
abline(h=0, col="red")

# 2. prediction at specified times
data(sealevel)
m <- tidem(sealevel)
# Check fit over 2 days (interpolating to finer timescale)
look <- 1:48
time <- sealevel[["time"]]
elevation <- sealevel[["elevation"]]
oce.plot.ts(time[look], elevation[look])
# 360s = 10 minute timescale
t <- seq(from=time[1], to=time[max(look)], by=360)
lines(t, predict(m, newdata=t), col='red')
legend("topright", col=c("black","red"),
legend=c("data","model"),lwd=1)
}