Automated Water Extraction Index (AWEI)

AWEI = 4 * (Green - SWIR2) - (0.25 * NIR + 2.75 * SWIR1)

(Mustafa et al, 2017)

Sources

Mustafa Mustafa T., Hassoon Khalid I., Hassan Modher and Abd Modher H. "Using water indices (NDWI, MNDWI, NDMI, WRI and AWEI) to detect physical and chemical parameters by apply remote sensing and GIS techniques". International Journal of Research - Granthaalayah 5, no. 10 (2017): 117-128.
https://doi.org/10.5281/zenodo.1040209.