Urban black and odorous water body grading method based on decision tree

Abstract

The invention discloses an urban black and odorous water body grading method based on a decision tree. A black and odorous degree of water bodies is judged by combining an existing urban black and odorous water body pollution degree grading standard. According to an international standard colorimetric card, the water bodies with different colors are associated with black and odorous water body categories. A representative spectrum library with various black and odorous water body types is established according to the comprehensively judged black and odorous degrees and the relationship betweenthe remote sensing reflectivity of the different types of water bodies and the black and odorous degrees. The mean value of the remote sensing reflectance of each black and odorous water body type iscalculated. A GF-2 satellite sensor PMS2 is responded by using a spectral response function to obtain an equivalent reflectance spectral curve of each urban black and odorous water body on the GF-2 satellite sensor PMS2. According to the characteristics of the equivalent reflectivity spectrum curve, water bodies of different black and odorous types are extracted by using a decision tree formed bywaveband combination models such as a black and odorous water body difference index DBWI, a black and odorous water body slope difference index DSBWI, a green light waveband Green and a normalized black and odorous water body index NDBWI.

Description

technical field [0001] The invention relates to the technical field of remote sensing, in particular to a method for grading urban black and odorous water bodies based on decision trees. Background technique [0002] The urban water environment is an important part of the urban ecological environment and is closely related to the lives of residents. However, in recent years, with the acceleration of industrialization and urbanization, urban environmental infrastructure has become increasingly insufficient, and the problem of urban river pollution has become increasingly serious. More than 80% of urban rivers in the country have been polluted, and many urban inland rivers have experienced perennial or seasonal black odor. Phenomenon. According to the existing research, the main cause of urban black and odorous water is the metabolism of algae and bacteria in the water and the excessive discharge of organic matter into the water by humans. Black and odorous water is an extre...

AI Technical Summary

Problems solved by technology

However, there are still few reports on the research on urban black and odorous water bodies based on the optical characteristics of water bodies, and the classification method for urban black and odorous water bodies is still immature

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