Calculate normalized difference index (NDI) — hsi_calc_ndi • HSItools

Calculate normalized difference index (NDI)

Usage

hsi_calc_ndi(
  x,
  bands,
  index_name = NULL,
  filename = "",
  overwrite = FALSE,
  ...
)

Arguments

x: A SpatRaster with hyperspectral data.
bands: Numeric vector of length 2. Wavelengths in nm.
index_name: Character. Name for the output layer. Default NULL.
filename: Character. Output filename. Default "" keeps result in memory.
overwrite: Logical. Overwrite existing file. Default FALSE.
...: Additional arguments passed to terra::writeRaster().

Value

A SpatRaster with NDI values.

See also

Other HSI Transformations: hsi_apply_mnf(), hsi_calc_difference(), hsi_calc_mnf(), hsi_calc_raba(), hsi_calc_rabd(), hsi_calc_ratio(), hsi_calc_rcv(), hsi_calc_reflectance(), hsi_calc_remp(), hsi_calc_rmean(), hsi_calc_rmedian(), hsi_calc_rsd(), hsi_calc_stretch(), hsi_destripe(), hsi_remove_continuum(), hsi_smooth_median(), hsi_smooth_savgol(), hsi_tiled(), hsi_write_scaled()

Examples

if (FALSE) { # \dontrun{
x <- terra::rast("REFLECTANCE_testdata.tif")

x_ndi <- hsi_calc_ndi(
  x,
  bands = c(570, 690)
)

x_ndi <- hsi_calc_ndi(
  x,
  bands = c(570, 690),
  index_name = "ndi570690",
  filename = "output_ndi.tif",
  overwrite = TRUE
)
} # }