Automatic extraction method of moraine covered glacier

Abstract

The invention discloses an automatic extraction method of a moraine coverage type glacier, which comprises the following steps: 1, preprocessing an optical image of a research area to obtain a multispectral waveband and texture features of the research area; 2, selecting proper topographic data to perform topographic analysis to obtain a slope, a plane curvature and a profile curvature corresponding to the research area; 3, calculating flow displacement characteristics of the research area by using an optical offset method; and 4, performing classification by adopting a random forest algorithm, and obtaining a moraine glacier contour. According to the method, the characteristic that the moraine glacier has fluidity is fully utilized, the optical offset technology is used for solving the flow displacement, then the random forest algorithm is combined for extracting the moraine glacier, the automation degree is high, and the extraction accuracy is high; the random forest algorithm solvesthe problem that the characteristic threshold, the characteristic use sequence and the combination are difficult to determine, and compared with a decision tree, the classification accuracy is improved; the flow velocity is increased, so that the accuracy of moraine glacier boundary extraction is greatly improved.

Description

technical field [0001] The invention belongs to the field of studying modern glaciology by using optical remote sensing technology, and relates to an automatic extraction method of moraine-covered glaciers. Background technique [0002] Changes in glaciers are seen as a sensitive indicator of climate change, and the land's most important freshwater resource. In recent years, under the background of global warming, glaciers in the Himalayas, known as the "Asian water tower", are an important part of the global mountain glaciers, which has attracted continuous attention from the glaciology community. For a long time, optical remote sensing technology has played an important role in studying the changes of glaciers on a large scale. Among them, moraine-covered glaciers are an important part of mountain glaciers, and their automatic extraction is of great significance to the study of glacier remote sensing changes. However, due to the spectral similarity between moraine-covere...

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Problems solved by technology

[0009] In view of the deficiencies in the prior art, the object of the present invention is to provide an automatic extraction method for moraine-covered glaciers, which solves the problems in the prior art that the accuracy of the extraction results is not high, the degree of automation is not high, and the threshold is difficult to determine It is difficult to apply to large-area surface moraine glacier extraction problems

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