Extraction of Gangnalou glacier velocity based on SAR migration tracking method

doi:10.13474/j.cnki.11-2246.2020.0350

Abstract

Abstract: Glacier dynamic change monitoring helps to reflect global and regional climate change and protect the natural environment and natural resources. In recent years, the research on glacier movement based on SAR data has become one of the mainstream technologies. The extraction of glacier velocity based on SAR mainly includes synthetic aperture radar interferometry, multi-aperture radar interferometry and offset tracking. In this paper, the intensity tracking method of SAR migration tracking method is used to extract the glacier velocity along the distance and direction of Gangnalou glacier in the northeast of Hala lake, Qinghai province. The results show that the extraction effect of the range direction glacier velocity is better, the maximum velocity reaches 15.36 m/a, the velocity decreases from both sides of the central axis, and tends to 0 at the end of the ice tongue; the maximum velocity of the azimuth direction extraction ice velocity reaches 18.27 m/a, but there are some directional streaks in the azimuth velocity diagram due to the ionosphere interference. Inaddition, due to the small component of ice velocity in azimuth and other factors, the accuracy of azimuth velocity extracted in this study is lower than that in distance.

Key words: synthetic aperture radar, Gangnalou glacier, offset tracking method, glacier velocity

CLC Number:

P237

ZHANG Shengpeng, ZHOU Zhongzheng, ZHAO Lijiang, ZHANG Yongying. Extraction of Gangnalou glacier velocity based on SAR migration tracking method[J]. Bulletin of Surveying and Mapping, 2020, 0(11): 33-38.

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