Polar ice cap melting detecting method

Abstract

The invention discloses a polar ice cap melting detecting method which comprises the following steps of a radar image acquiring step, namely acquiring a polar image through a satellite-borne polarized synthetic aperture radar; an image preprocessing step, namely performing noise reduction processing on the acquired polarized image of the satellite-borne polarized synthetic aperture radar, thereby suppressing speckle noise; a polarization decomposition step, namely performing non-coherent polarization decomposition on the polarized image, and obtaining each decomposition parameter; a sampling analyzing step, namely selecting a glacial zone with a typical characteristic from the polarized image for performing sample analysis; a classifying step, namely establishing and correcting a classifier, classifying the glacial zone, and obtaining a glacial zone distribution result; and a detecting result generating step, namely performing reprojection and geographical coordinate correction on the glacial zone distribution result, and performing mapping for generating a polar ice cap melting detecting result. The polar ice cap melting detecting method overcomes a defect of overhigh dependence on auxiliary information and area restriction in previous polar ice cap melting detecting method through the satellite-borne polarized synthetic aperture radar and furthermore improves classification precision.

Description

technical field [0001] The invention relates to the technical field of radar detection, in particular to a method for realizing high-precision freezing and thawing detection of polar ice caps by using spaceborne polarization synthetic aperture radar. Background technique [0002] As the Antarctic continent has most of the glaciers and freshwater resources in the world, changes in the distribution of ice sheets and glaciers have an important impact and research value on global climate change and freshwater resource distribution. Among them, the freezing and thawing of the Antarctic ice sheet plays an important role in controlling the heat exchange between the earth's surface and the atmosphere and the absorption of solar radiation on the surface, and is of great significance in reflecting and controlling the state of global climate change. The traditional radar signal processing technology uses synthetic aperture (SAR) technology for azimuth clutter suppression, and beamformi...

AI Technical Summary

Problems solved by technology

The glacier zone classification method using auxiliary information such as altitude can only be applied to local areas, and the classification accuracy is not high, and the change detection algorithm is not portable and flexible

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