amber (version 1.0.3)

intFun.theta: Time distance in months

Description

Consider two rasters that show the month of the maximum value of a variable during the climatological mean annual cycle. Calculating the absolute difference between both rasters may yield values that range from 0 to 11 (type a). A more meaningful range that considers the circular nature of the annual cycle would range from 0 to 6 (type b). This function converts a raster of type (a) to type (b).

Usage

intFun.theta(x)

Arguments

x

A raster object of type (a)

Value

A raster object of type (b)

Examples

# NOT RUN {
library(raster)
# create a raster object with NA
data <- runif(100,0,11)
data <- matrix(data, ncol=10)
data <- raster::raster(data)
# replace NA with zero in raster object
data <- calc(data,intFun.theta)
plot(data); text(data)

# }