Multi-spectral remote sensing image water body extraction method oriented to multi-service system fusion

The invention discloses a multispectral remote sensing image water body extraction method oriented to multi-service system fusion. The method comprises the following steps: S101) acquiring multispectral remote sensing image data of a target area; s102) preprocessing the multispectral remote sensing image data; s103) selecting water body and non-water body typical ground features for analysis, and constructing spectral curves of different ground features; s104) fusing the normalized vegetation index and the process infrared index to construct a visible light infrared fusion index model; and S105) inputting the preprocessed remote sensing image, and extracting water body pixels through a visible light infrared fusion water body index algorithm model. According to the method, the problem that the water body and the house shadow in the remote sensing image are extremely easy to confuse can be solved, the surface water change can be quickly mastered, the requirements of underpass rainstorm ponding simulation and a