Satellite remote sensing method and system for monitoring water body entering sea drain outlet

Abstract

The invention discloses a satellite remote sensing method and system for monitoring a water body entering a sea drain outlet, and the method comprises the steps: selecting a research region, after the region is selected, downloading satellite remote sensing data, and carrying out the data preprocessing, thereby obtaining Rayleigh correction reflectivity Rrc data; masking the construction land on the shore, and obtaining construction land pixels and non-construction land pixels; identifying mud flat pixels and non-mud flat pixels from the obtained non-construction land pixels; and on the basis of a chromaticity method, performing discharge port water body pixel identification on the non-mudflat pixels, and obtaining discharge port water body pixels. According to the method, on the basis of spectral features and color features of the polluted water at the sea discharge outlet, a model for extracting the polluted water at the sea discharge outlet of a decision tree based on NDWI and a chromaticity method is established by using Rayleigh correction reflectivity Rrc data of a satellite, so that the discharge conditions such as the discharge range, the flow direction and the diffusion range of the polluted water at the sea discharge outlet can be accurately monitored; and a basis is provided for the local government to formulate management policies.

Description

technical field [0001] The invention relates to the technical field of satellite remote sensing, in particular to a satellite remote sensing method and system for monitoring the water body of a sewage outlet into the sea. Background technique [0002] Although the overall condition of my country's marine ecological environment is good, polluted seawater still exists in various sea areas, especially in the eastern coastal waters of my country. The degree of eutrophication of seawater has reached moderate to severe, and inorganic nitrogen and active phosphate are the main indicators exceeding the standard. Therefore, the protection of the marine environment is imperative. [0003] For remote sensing monitoring of sewage discharged into the sea, predecessors often used the inversion model of important water quality parameters such as Chl-a concentration and total suspended solids concentration to evaluate water quality. Li Xiaobin et al. (2007) used the measured inorganic nitr...

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