rts (version 1.0-12)

apply.monthly: Apply a function over calendar periods

Description

Apply a specified function to each distinct period in a given raster time series object.

Usage

apply.daily(x, FUN, ...)
apply.weekly(x, FUN, ...)
apply.monthly(x, FUN, ...)
apply.quarterly(x, FUN, ...)
apply.yearly(x, FUN, ...)

Arguments

x

a raster time series (Raster*TS) object, created by rts

FUN

an R function

...

additional arguments to FUN

Value

A raster time series (Raster*TS) object

Details

These functions offer Simple mechanism to apply a function to non-overlapping time periods, e.g. weekly, monthly, etc, and return a raster time series object including a raster layer for each period in the original data, produced by FUN. The end of each period of time is assigned to the corresponding raster layer in the output.

See Also

endpoints, period.apply,

Examples

file <- system.file("external/ndvi", package="rts")

ndvi <- rts(file) # read the ndvi time series from the specified file
ndvi
ndvi.y <- apply.yearly(ndvi, mean) # apply mean function for each year
ndvi.y
ndvi.q <- apply.quarterly(ndvi,sd) # apply sd function for each quarter of years
ndvi.q