calc_ndsi: Calculate Normalized Difference Snow Index (NDSI)

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

Calculate Normalized Difference Snow Index (NDSI)

Description

Computes the Normalized Difference Snow Index (NDSI) for mapping snow and ice cover.

Usage

calc_ndsi(green, swir1)

Arguments

green	Green band (terra::SpatRaster or numeric).
swir1	Short-wave infrared 1 band (terra::SpatRaster or numeric).

Details

NDSI = \frac{GREEN - SWIR1}{GREEN + SWIR1}

Value

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

References

Hall, D. K., Riggs, G. A., & Salomonson, V. V. (1995). Development of methods for mapping global snow cover using moderate resolution imaging spectroradiometer data. Remote Sensing of Environment, 54(2), 127-140.

See Also

geo_index

Examples

calc_ndsi(green = 0.8, swir1 = 0.2)

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