Urban black and odorous water body identification method based on remote sensing spectrum

Abstract

The invention discloses an urban black and odorous water body identification method based on a remote sensing spectrum, and the method comprises the following steps: S1, obtaining the remote sensing spectrum data of a to-be-identified point on a water surface; S2, preprocessing the data; S3, extracting black and odorous water body discrimination features of the image, the black and odorous water body discrimination features including extracting angles at a green band (Green) and a red band (Red) in the relation graph of the remote sensing reflectivity and the wavelength, the angle at the greenband (Green) being alpha 1, and the angle at the red band (Red) being alpha 2; and S4, presetting an interval of angles alpha 1 and alpha 2, and judging the black and odorous water body. The invention provides a novel method for identifying urban black and odorous water. The sizes of angles alpha 1 and alpha 2 at a green band and a red band in the remote sensing reflectivity and wavelength relational graph are used as characteristics; the sizes of the angles alpha 1 and alpha 2 are calculated through a formula, the black and odorous water body is recognized according to the set judgment interval of alpha 1 and alpha 2, recognition of the black and odorous water body is achieved through the remote sensing technology, and the method has popularization value.

Description

technical field [0001] The invention belongs to the technical field of remote sensing image processing, and in particular relates to a method for identifying black and odorous water bodies in cities based on remote sensing spectra. Background technique [0002] Black and odorous water body is a kind of water body that has lost its ecological function, which is mainly formed by excessive pollution of water body. Black and odorous river water is characterized by abnormal odor and color, reduced survival of aquatic organisms, and severe deterioration of the structure and function of the river ecosystem. With the acceleration of urbanization, black and odorous water bodies have received more and more attention internationally, especially in China. [0003] At present, the identification of black and odorous water bodies in my country is mainly in the form of questionnaires based on human subjective judgments, and in the form of evaluation indicators based on water quality testi...

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Problems solved by technology

Although these methods can accurately judge whether the water body is black and smelly, they need to consume a lot of manpower, material and financial resources, and it is difficult to find out in time and supervise at any time

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