Extract Endmember Spectra from a Cube

Extracts endmember spectra from specified pixel locations.

Usage

hs_endmembers(cube, pixels, labels = NULL)

Arguments

cube

An hsi_cube object.

pixels

Data.frame or matrix with columns x (col) and y (row).

labels

Character vector of class labels for each pixel. Default NULL (auto-generated).

Value

A named matrix with endmember spectra (rows = endmembers, cols = bands).

Examples

cube <- hs_example_cube()
pixels <- data.frame(x = c(5, 25), y = c(5, 25))
em <- hs_endmembers(cube, pixels, labels = c("region_1", "region_2"))
dim(em)
#> [1]  2 61