极地研究2025，Vol.37Issue(3)：453-463,11.DOI:10.13679/j.jdyj.20230066
基于ICESat-2测高数据的南极冰下湖轮廓提取算法研究
Research on an outline extraction algorithm of Antarctic subglacial lakes based on ICESat-2 altimetry data
摘要
Abstract
The evolution of Antarctic subglacial lakes is closely related to global climate change.Active subglacial lakes undergo significant changes in area and volume with the processes of storage and drainage.It is nec-essary to track and accurately extract outlines of Antarctic subglacial lakes for an in-depth understanding of subglacial hydrological processes and the mass balance of ice sheets.In this paper,we use ATL11 data from the ICESat-2 laser altimeter to extract the active subglacial lake outlines of the Byrd Glacier and Whillans ice flows in the Ross Ice Shelf,Antarctica.Then,we analyze the lake water potential hydrology using the DBSCAN cluster,Graham,and AlphaShape algorithms.The results show that the extracted subglacial lake outlines conform to the hydrological law,and the outlines of Byrd S10,Whillans 6,and other lakes are sim-ilar to those described in the latest report from 2022.There is a large amount of water at the intersection and classification of ice flows to promote the formation and expansion of lakes,and this phenomenon has obvi-ous spatiotemporal characteristics.The outline extraction algorithm described in this paper is suitable for various shapes of subglacial lake point clouds and offers increased accuracy.关键词
ICESat-2测高数据/DBSCAN聚类算法/Graham算法/Alphashape算法/水势方程/南极冰下湖轮廓Key words
ICESat-2 altimetry data/DBSCAN cluster algorithm/Graham algorithm/AlphaShape algorithm/water potential equation/Antarctic subglacial lake outlines引用本文复制引用
万佳乐,刘俊,汤登晖,李超,陈丽辉..基于ICESat-2测高数据的南极冰下湖轮廓提取算法研究[J].极地研究,2025,37(3):453-463,11.基金项目
国家自然科学基金(42201489)资助 （42201489）
