The C2 NDSI science product is the normalized difference between spectral bands green (G) and the shortwave infrared (SWIR). The NDSI is particularly useful for separating snow from vegetation, soils, and lithology endmembers.

The Normalized Difference Snow Index (NDSI) snow cover is an index that is related to the presence of snow in a pixel and is a more accurate description of snow detection as compared to Fractional Snow Cover (FSC).

NDSI is the normalized difference between spectral bands green (G) and shortwave infrared (SWIR). NDSI is useful for separating snow from vegetation, soils, and other spectral signatures, and is delivered as a single band.

Moderate Resolution Imaging Spectroradiometer (MODIS) and NASA Visible Infrared Imaging Radiometer Suite (VIIRS) snow-cover products are snow-covered area maps that provide swath-based and daily maps of the Earth's land areas.

The Normalized Difference Snow Index (NDSI) is designed to use MODIS (band 4 and band 6) and Landsat TM (band 2 and band 5) for identification of snow cover while ignoring cloud cover. Since it is ratio based, it also mitigates atmospheric effects. NDSI = (Green - …

Mar 10, 2023 · Maps of calculated NDSI from Sentinel-2 versus the classified maps using NDSI and five machine learning classifiers in four study regions.

Jul 25, 2023 · NDSI usually ranges from -5 to 1, with ~0.5 to 1 representing snow cover. Time series and anomaly maps of NDSI clearly show changes in snow cover for a region. Positive anomalies indicate increased snow cover, whereas negative anomalies indicate decreased snow cover relative to average conditions.

Sep 24, 2021 · NDSI is a measure of the relative magnitude of the reflectance difference between visible (green) and shortwave infrared (SWIR). It controls variance of two bands (one in the near infrared or short-wave infrared and another one in the visible parts of the spectrum). This is useful for snow mapping.

May 15, 2023 · This graphic shows an example of the Landsat Collection 2 Surface Reflectance-derived Normalized Difference Snow Index (NDSI) near Sacramento, California. Left: Landsat Collection 2 Surface Reflectance image; Right: Landsat Collection 2 NDSI. Learn more about NDSI at https://www.usgs.gov/landsat-missions/normalized-difference-snow-index.

Map snow in Landsat 8/9 and Sentinel-2 imagery by thresholding the Normalized Difference Snow Index (NDSI).