Glacier and accumulated snow automatic extraction method and system based on remote sensing image

Abstract

The invention discloses a glacier and accumulated snow automatic extraction method based on a remote sensing image, and the method comprises the following steps: obtaining a satellite remote sensing image of a to-be-extracted region, and preprocessing the satellite remote sensing image; performing glacier and accumulated snow crude extraction on the preprocessed satellite remote sensing image by using a normalized accumulated snow index threshold method, and determining a suspected range; acquiring DEM auxiliary data of a to-be-extracted area, calculating multidimensional features including spectral values, standard deviations and DEM features in combination with the remote sensing image; performing mask processing on the multi-dimensional features in the to-be-extracted area by using the glacier and snow suspected range to obtain multi-dimensional features in the suspected range; collecting samples in a suspected range, selecting multi-dimensional features, and using a decision tree model to realize fine extraction of glacier and accumulated snow.

Description

technical field [0001] The invention relates to the technical field of remote sensing measurement, in particular to a method and system for automatically extracting glaciers and snow cover based on remote sensing images. Background technique [0002] Glaciers and snow cover are important freshwater resources on the surface, and generally exist in high-latitude areas or alpine areas in mid-low latitudes. In remote sensing images, glaciers and snow cover appear as snow cover types. Different from other ground cover types, snow cover has unique spectral characteristics, showing high reflectivity in the visible light range, and high reflectivity in the near-infrared range. This spectral characteristic of snow cover is the physical basis for optical remote sensing monitoring of snow cover. [0003] At present, the commonly used snow extraction methods are: 1) band calculation extraction; band calculations include band ratio method and normalized snow index method. 2) Extraction...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems in related technologies, the present invention proposes a method and system for automatically extracting glaciers and snow cover based on remote sensing images, which analyzes the characteristics of ground features from multi-dimensional features, effectively integrates DEM and spectral information, and avoids the single feature dimension, which causes Low identification accuracy of glaciers and snow; at the same time, comprehensively using snow cover index method and decision tree algorithm, on the basis of snow cover index method extraction, with the advantage of decision tree algorithm that can simultaneously process data type and conventional type attributes, mining Extraction rules of glaciers and snow to improve the accuracy of glacier and snow extraction

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