nightmares (version 0.0.2)

NDVI: NDVI - Normalized Difference Vegetation Index

Description

NDVI is used to quantify vegetation greenness and is useful in understanding vegetation density and assessing changes in plant health. This function requires the Red and Near Infrared values.

Usage

NDVI(R, NIR)

Arguments

R

A raster layer object with the reflectance values for the Red band.

NIR

A raster layer object with the reflectance values for the Near Infrared band.

Value

NDVI - Normalized Difference Vegetation Index.

References

https://www.usgs.gov/core-science-systems/nli/landsat/landsat-surface-reflectance-derived-spectral-indices. https://www.geo.university/pages/spectral-indices-with-multispectral-satellite-data.

Examples

# NOT RUN {
library(raster)
path_files <- system.file("extdata/", package="nightmares")
bands <- stack(list.files(path_files,".tif", full.names=TRUE))
x <- ref_oli(bands, sun.elev= 67.97)
NDVI(x[[4]], x[[5]])

# }