calc_gndvi: Calculate Green Normalized Difference Vegetation Index...

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

Calculate Green Normalized Difference Vegetation Index (GNDVI)

Description

Computes the Green Normalized Difference Vegetation Index (GNDVI) from near-infrared (nir) and green (green) bands.

Usage

calc_gndvi(nir, green)

Arguments

nir	Near-infrared band (terra::SpatRaster or numeric).
green	Green band (terra::SpatRaster or numeric).

Details

GNDVI = \frac{NIR - GREEN}{NIR + GREEN}

Description & Purpose: GNDVI is more sensitive to chlorophyll variations than standard NDVI, especially in mid-to-high biomass stages and dense crops.

Value

A terra::SpatRaster (named "GNDVI") or numeric vector with index values.

References

Gitelson, A. A., Kaufman, Y. J., & Merzlyak, M. N. (1996). Use of a green channel in remote sensing of global vegetation from EOS-MODIS. Remote Sensing of Environment, 58(3), 289-298.

See Also

calc_ndvi, geo_index

Examples

calc_gndvi(nir = 0.8, green = 0.2)

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