plot_index: Visualize a Spectral Index with Thematic Color Palettes

In GeoIndexR: Computation of Spectral and Geospatial Indices from Multispectral Raster Data

Visualize a Spectral Index with Thematic Color Palettes

Description

Plots a single-layer or selected layer from a terra::SpatRaster index object using tailored color palettes designed for vegetation, water, soil, urban, and custom analysis.

Usage

plot_index(x, index = NULL, main = NULL, col = NULL, ...)

Arguments

x	A terra::SpatRaster object containing index values.
index	Optional character string specifying which layer to plot if x contains multiple layers.
main	Optional plot title. Defaults to the layer name.
col	Optional color palette. If NULL (default), an appropriate palette is automatically chosen based on the index category or a perceptual palette for custom indices.
...	Additional graphical arguments passed to terra::plot.

Value

Invisible terra::SpatRaster object that was plotted.

Examples

img <- get_example_data()
ndvi <- geo_index(img, "NDVI")
plot_index(ndvi)

GeoIndexR documentation built on Oct. 10, 2026, 5:08 p.m.