A New Combination of Water Index Model Based on TM Image

Abstract

A new water index is proposed for the problem that the normalized difference vegetation index and the modified normalized difference water index cannot suppress bare land information in the process of extracting water. Using the reflectance difference between the green and mid-infrared bands as the molecule and the reflectance and value of the near-infrared and red bands as denominators, a new combined water index was constructed. The index not only effectively suppress vegetation and building noise, but also further widen the contrast between water and bare land, reducing the interference of bare ground information on water extraction.