The Sentinel program is composed of two satellites (Sentinel 2A, 2B) and was developed to monitor land surface changes in vegetation, the environment, and land cover. Sentinel-2 spatial, spectral, and temporal resolutions allow for imagery to be processed at sufficient spatial and temporal detail that is optimal for field scale land surface monitoring, management, and research. Sentinel-2 datasets are available for Sentinel 2A, 2B, and composite of 2A/2B using top of atmosphere or at surface reflectance data.
Normalized Difference Water Index (NDWI) (Green/NIR) is a water index which provides information on open water extent. This product typically ranges from -1 to 0.2 where water is typically above 0 (Özelkan 2020). This product is useful for identifying open water to use in estimating water surface area or removal through masking.
NDWI (Green/NIR) is the normalized difference between the green and near infrared (NIR) bands following the equation NDWI = (Green-NIR)/(Green+NIR). Water reflects Green and absorbs NIR electromagnetic radiation while vegetation and soil absorbs Green and reflects NIR electromagnetic radiation (McFeeters 1996). The result is a high normalized difference (ND) over water and a low ND over land with high contrast.
Green: 0.560 μm (S2A) / 0.559 μm (S2B)
Near Infrared (NIR): 0.8351 μm (S2A) / 0.833 μm (S2B)
Period of Record
McFeeters, S. K. (1996). The use of the Normalized Difference Water Index (NDWI) in the delineation of open water features. International journal of remote sensing, 17(7), 1425-1432.
Özelkan, E. (2020). Water body detection analysis using NDWI indices derived from Landsat-8 OLI. Polish Journal of Environmental Studies, 29(2), 1759-1769.
End User License Agreement
View the End User License Agreement conditions
Your license is subject to your prior acceptance of either this Licensed Application End User License Agreement (“Standard EULA”), or a custom end user license agreement between you and the Application Provider (“Custom EULA”), if one is provided.