To further study the climatic issue,taking the Geladandong glacier as the object and employing remote sensing and geographical information technology,the glacier variation condition in Geladandong,a source area of Yangtze River,was studied. Based on the collected images of Landsat -TM and Landsat8 -OLI_TIRS, DEM and glacier inventory data in 1992, 2002, 2009,2015,the CART decision tree was applied to extract the information of Geladandong glacier,so the change analysis on the glacier areas in 3 periods of 1992~2002,2002~2009,2009~2015 was carried out.The analysis showed that the glacial area of the Geladandong retreated 78.97 km2,accounting 8.6%of the total glacial area;the glaciers distributed between the elevation of 5200 m to 6600 m,and the upper retreat limit of the glacier was 5800 m.In addition, the glacier inclination influence and length variation were studied.The study concluded that the glacier retreat caused by the global warming would continue.%为了进一步研究气候问题,以各拉丹冬冰川变化为研究对象,利用遥感技术和地理信息技术,对长江源各拉丹冬地区冰川变化情况进行了分析研究.搜集了1992,2002,2009,2015年四个时相的Landsat-TM影像和Landsat8-OLI_TIRS影像、DEM数字高程模型和冰川编目数据,并使用CART决策树方法提取冰川信息,研究1992~2002,2002~2009,2009~2015年三个时段的冰川变化情况.研究结果表明:1992~2015年各拉丹冬冰川退缩78.97 km2,占总面积的8.6%;各拉丹冬冰川的海拔范围在5200~6600 m之间,冰川退缩上限海拔为5800 m.另外,对各朝向对冰川的影响和冰川长度的变化进行了研究.研究认为,全球变暖现象导致的冰川退缩现象依然持续.
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