calc_awei: Calculate Automated Water Extraction Index (AWEI)

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

Calculate Automated Water Extraction Index (AWEI)

Description

Computes the Automated Water Extraction Index (AWEI) to extract surface water while suppressing shadow artifacts and dark impervious surfaces.

Usage

calc_awei(green, nir, swir1, swir2)

Arguments

green	Green band (terra::SpatRaster or numeric).
nir	Near-infrared band (terra::SpatRaster or numeric).
swir1	SWIR 1 band (terra::SpatRaster or numeric).
swir2	SWIR 2 band (terra::SpatRaster or numeric).

Details

AWEI = 4 \times (GREEN - SWIR1) - (0.25 \times NIR + 2.75 \times SWIR2)

Value

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

References

Feyisa, G. L., Meilby, H., Fensholt, R., & Proud, S. R. (2014). Automated Water Extraction Index: A new technique for surface water mapping using Landsat imagery. Remote Sensing of Environment, 140, 23-35.

See Also

calc_ndwi, calc_mndwi, geo_index

Examples

calc_awei(green = 0.5, nir = 0.2, swir1 = 0.1, swir2 = 0.05)

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