im.dvi: Compute the Difference Vegetation Index (DVI)

In imageRy: Modify and Share Images

Compute the Difference Vegetation Index (DVI)

Description

This function calculates the Difference Vegetation Index (DVI) from a multispectral raster image. The DVI is computed as the difference between the Near-Infrared (NIR) and Red bands.

Usage

im.dvi(x, nir, red)

Arguments

x	A 'SpatRaster' object representing the input multispectral image.
nir	An integer specifying the band index of the Near-Infrared (NIR) channel.
red	An integer specifying the band index of the Red channel.

Details

The Difference Vegetation Index (DVI) is a simple vegetation index used to assess plant health. It is calculated as:

DVI = NIR - Red

Higher values indicate denser and healthier vegetation.

Value

A 'SpatRaster' object containing the computed DVI values.

References

For more details on the DVI index, see: https://en.wikipedia.org/wiki/Vegetation_Index

See Also

[im.classify()], [im.ridgeline()]

Examples

library(terra)

# Load a multispectral raster image with 3 bands
r <- rast(system.file("ex/logo.tif", package = "terra"))

# Compute DVI using band 2 (proxy for NIR) and band 1 (Red)
dvi_raster <- im.dvi(r, nir = 2, red = 1)

plot(dvi_raster)

imageRy documentation built on Aug. 8, 2025, 7:31 p.m.