Remote sensing extraction method, remote sensing extraction device and remote sensing extraction system for polluted water body at drainage outlet

Abstract

The invention discloses a remote sensing extraction method, a remote sensing extraction device and a remote sensing extraction system for polluted water body at drainage outlets and belongs to the field of pollution monitoring for water body. The method includes the steps of: a) on the basis of a high-spatial-resolution remote-sensing reflectance image, constructing spectral libraries of a polluted water body and a normal water body, calculating characteristic values of different wave bands in the spectral data of the polluted water body and the normal water body, and screening a characteristic wave band by comparing the characteristic values between the polluted water body and the normal water body, and respectively setting threshold values according to the characteristic value of the characteristic wave band of spectrum of the polluted water body; b) performing comparison to every pixels in the remote-sensing reflectance image waveband by waveband, if a comparison result is true, marking the pixel as a polluted water body pixel; and c) performing extraction of position information and counting of pixel number to the polluted water body pixels so as to acquire position and area of the polluted water body. The method has stronger pertinence to extraction of the polluted water body and greatly increases precision of recognizing the position and area of the polluted water body, thereby high-effectively, quickly and accurately extracting the distribution range and area of the polluted water body.

Description

technical field [0001] The invention relates to the field of water body pollution monitoring, in particular to a remote sensing extraction method, device and system for polluting water bodies at sewage outlets. Background technique [0002] Due to the arbitrary discharge of polluted water bodies along the river, along the river, and along the coast, and unreasonable water use, the waters near the sewage outlets are often polluted, seriously affecting the function of the water body, and causing great harm to the lives of residents along the coast. The urban planning and industrial layout along the river and along the river are unreasonable, and the water intake and drainage are distributed in a staggered manner. Domestic and industrial sewage is directly discharged into the rivers, lakes and seas through ground ditches or underground pipes, which seriously damages the self-purification ability of the water body and makes the river water body eutrophication serious. The water ...

AI Technical Summary

Problems solved by technology

[0004] The traditional monitoring method of sewage mass in sewage outlets relies on manpower and material resources to comprehensively judge the water quality parameters measured on site and the color of the water near the sewage outlets, which is time-consuming, labor-intensive, and requires a large amount of capital investment; It is remote, the monitoring personnel and vehicles are difficult to approach, the water quality monitoring equipment cannot play a role, and the effective investigation of the sewage discharge status of the sewage outlet cannot be carried out; in addition, most of the traditional monitoring methods start to organize relevant personnel to carry out on-site investigation after receiving the report information, which cannot Timely obtain the distribution of sewage clusters when the sewage is discharged from the sewage outlet

Moreover, the traditional method for judging the sewage distribution area is mainly based on the estimation of visual measurement, which has a certain gap with the actual area affected by the sewage mass.

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