CrownScorchTLS (version 0.1.1)

add_reflectance: Add Reflectance column to LAS if it is missing for RIEGL vz400i

Description

Function to provide relative Reflectance for RIEGL vz400i. Lidar prediction of crown scorch is based on relative range-corrected reflectance relative to a white reference object orthonormal to scanner. Raw range-corrected amplitudes from RIEGL vz400i are linearly correlated to relative intensity which usually ranges from -20 dB to 0 dB

Usage

add_reflectance(las)

Value

modified LAS object with Reflectance column

Arguments

las

`LAS` object from `lidR` package representing an individually segmented tree containing an `Intensity` column representing 16-bit range- corrected amplitude from RIEGL vz400i Terrestrial Lidar Scanner

Examples

library(lidR)
library(CrownScorchTLS)

 #download external data from github repo
url <- paste0(
  "https://raw.githubusercontent.com/jbcannon/CrownScorchTLS-data/main/data/manual-clip-trees/",
  "M-04-15549_post.laz")
 las_file = tempfile(fileext = paste0(".", tools::file_ext(url)))
 download.file(url, las_file, mode = "wb", quiet = TRUE)
 las <- readLAS(las_file)

 # or load your own data
 #las <- readLAS('C:/path/to/your/file.laz')

las = add_reflectance(las)
colnames(las@data)