Spectral index model-based black and odorous water body identification method and system

Abstract

The invention discloses a spectral index model-based black and odorous water body identification method and system. The identification method comprises the steps of processing a selected high-spatial-resolution remote sensing image, superposing a river system vector document or a mask file corresponding to the processed fused remote sensing reflectance image to the fused remote sensing reflectance image, extracting river in the fused remote sensing reflectance image to obtain a river remote sensing image; obtaining blue, green, red and near-infrared bands of each pixel in the river remote sensing image and calculating a black and odorous spectral index according to the bands and a preset spectral index model; and determining the category of the water body corresponding to each pixel according to the relationship between the spectral index of each pixel unit and preset first threshold and second threshold. By adopting the black and odorous spectral index model, the identified black and odorous spectral index of the urban river is more accurate, the categories of the water bodies of the rivers are divided into a heavy black and odorous water body, a light black and odorous water body and a general water body, and differentiation of the water bodies is more detailed.

Description

technical field [0001] The invention relates to the field of remote sensing image processing, in particular to a method and system for identifying black and odorous water bodies based on a spectral index model. Background technique [0002] Urban black and odorous water body refers to the general term for unpleasant colors and / or unpleasant smells in urban construction areas. With the rapid development of urbanization and the sharp increase of population density, a large amount of domestic sewage and industrial wastewater are discharged into urban rivers, causing the water quality of urban water bodies to deteriorate day by day, and some water bodies even have severe seasonal or year-round black and odorous phenomena, which are harmful to urban rivers. The ecological system has brought a lot of pressure, causing harm to the health and daily life of urban residents, and causing adverse effects on urban landscape and urban development. In the face of very severe water polluti...

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Problems solved by technology

[0003] At present, the identification of urban black and odorous water bodies mainly relies on conventional ground monitoring methods. However, this method requires the deployment of a large number of manual monitoring points, which not only wastes a lot of manpower, material and financial resources, but also cannot achieve long-term tracking and monitoring. Moreover, The water environmental information obtained also has great limitations

[0004] In the prior art, satellite remote sensing technology is usually used to monitor urban water systems, but for identifying black and odorous water bodies from satellite remote sensing images, the identification methods currently used have a low accuracy rate, and the division of black and odorous water systems is also difficult. Not meticulous

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