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Modified normalised difference water index

MNDWI = (G - MIR ) / (G + MIR)

The MNDWI is derived from the NDWI defined by Mcfeeters (1996) by the use of middle infrared instead of near-infrared (Xu, 2006). Water bodies are better delineated by a more efficient discrimination between open surface water and dry surfaces.

References: Xu, H. Q., 2006. Modification of normalised difference water index (NDWI) to enhance open water features in remotely sensed imagery. International Journal of Remote Sensing 27, 3025-3033