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L-moments and L-moment ratios

metrics_Lmoments.Rd

Calculates L-moments and L-moment ratios of point cloud heihts.

Usage

metrics_Lmoments(z, zmin = NA)

.metrics_Lmoments

Format

An object of class formula of length 2.

Arguments

z

Z coordinate of the point cloud (point heights)

zmin

numeric. Minimum z value. If set, z values (heights) below are ignored in calculations.

Value

A list. L-moments and L-moment ratios

  • L-moments: L1, L2, L3, L4

  • L-moment ratios: Lskew (L3/L2), Lkurt (L4/L2), and Lcoefvar (L2/L1)

Examples

library(lidR)
library(lidRmetrics)
LASfile <- system.file("extdata", "Megaplot.laz", package="lidR")
las <- readLAS(LASfile, select = "*", filter = "-keep_random_fraction 0.5")

m1 <- cloud_metrics(las, ~metrics_Lmoments(z = Z))

m2 <- pixel_metrics(las, ~metrics_Lmoments(z = Z, zmin = 2), res = 20)