Compute Normalized Difference Index (General Purpose) — hs_ndi • hyperspectR

NDI = (R_band1 - R_band2) / (R_band1 + R_band2). A flexible building block for any two-band ratio index.

Usage

hs_ndi(cube, band1, band2)

Arguments

cube: An hsi_cube object.
band1: Numeric. Center wavelength or range c(min, max) for first band.
band2: Numeric. Center wavelength or range c(min, max) for second band.

Value

A numeric matrix with values in [-1, 1].

Examples

cube <- hs_example_cube()
ndi <- hs_ndi(cube, band1 = 540, band2 = 660)
range(ndi, na.rm = TRUE)
#> [1] -0.4915291 -0.2375021