calc_arvi: Calculate Atmospherically Resistant Vegetation Index (ARVI)

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

Calculate Atmospherically Resistant Vegetation Index (ARVI)

Description

Computes the Atmospherically Resistant Vegetation Index (ARVI), which uses the difference between blue and red bands to reduce atmospheric aerosol effects on red reflectance.

Usage

calc_arvi(nir, red, blue, gamma = 1)

Arguments

nir	Near-infrared band (terra::SpatRaster or numeric).
red	Red band (terra::SpatRaster or numeric).
blue	Blue band (terra::SpatRaster or numeric).
gamma	Aerosol resistance coefficient. Defaults to 1.0.

Details

ARVI = \frac{NIR - RB}{NIR + RB}

where RB = RED - \gamma \times (BLUE - RED).

Value

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

References

Kaufman, Y. J., & Tanre, D. (1992). Atmospherically resistant vegetation index (ARVI) for EOS-MODIS. IEEE TGRS, 30(2), 261-270.

See Also

calc_ndvi, calc_evi, geo_index

Examples

calc_arvi(nir = 0.7, red = 0.2, blue = 0.1)

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