The NDWI is used to monitor changes related to water content in water bodies. As water bodies strongly absorb light in visible to infrared electromagnetic spectrum, NDWI uses green and near infrared bands to highlight water bodies. It is sensitive to builtup land and can result in overestimation of water bodies. The index was proposed by McFeeters, 1996.
Sentinel2 NDWI = (B03 B08) / (B03 + B08)
Landsat 15 MSS NDWI = (B01 B04) / (B01 + B04)
Landsat 45 TM NDWI = (B03 B05) / (B03 + B05)
Landsat 7 ETM+ NDWI = (B02 B04) / (B02 + B04)
Landsat 8 NDWI = (B03 B05) / (B03 + B05)
MODIS NDWI = (B04 B02) / (B04 + B02)