srw: Radial Wavelength Metrics

In bioXgeo/geodiv: Methods for Calculating Gradient Surface Metrics

Radial Wavelength Metrics

Description

Calculates the dominant radial wavelength, radial wavelength index, and mean half wavelength of the radial Fourier spectrum. See Kedron et al. (2018) for more detailed description.

Usage

srw(x, create_plot = FALSE, option = c(1, 2, 3))

Arguments

x	A raster or matrix.
create_plot	Logical. If TRUE, returns a plot of the amplitude spectrum with lines showing the radii at which Srw, Srwi, and Shw are calculated.
option	Numeric. Code for which output metric(s) to return. 1 = Srw, 2 = Srwi, 3 = Shw.

Value

A vector containing numeric values for the dominant radial wavelength, radial wavelength index, and mean half wavelength.

Examples

# import raster image
data(normforest)
normforest <- terra::unwrap(normforest)

# calculate metrics
srwvals <- srw(normforest)

# extract each value
Srw <- srwvals[1]
Srwi <- srwvals[2]
Shw <- srwvals[3]

bioXgeo/geodiv documentation built on Oct. 17, 2023, 5:58 a.m.