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  • 软件名称:西藏年楚河流域冰川变化监测方法研究
  • 软件大小: 0.00 B
  • 软件评级: ★★★
  • 开 发 商: 扎西央宗,李林,卓玛,冯岩,李学东,白玛央宗
  • 软件来源: 《遥感技术与应用》
  • 解压密码:www.gissky.net

资源简介

摘要: 利用1996年、2005年两个时相的Landsat-5 TM数据及其冰雪指数、水体指数等,结合同时期ERS\|1/2、ENVISAT ASAR的合成孔径雷达(Synthetic Aperture Radar,SAR)数据的强度信息、相干信息等特征参数引入支持向量机(Support Vector Machine,SVM)分类器,针对西藏年楚河流域的冰川信息进行了分类提取。结果表明:光学与SAR影像特征组合经过优选后,可有效区分冰川和水体,两个时相的总体识别精度分别为84%和85%。在两期分类专题图结果基础上,进一步对冰川边界、面积的变化情况进行了分析研究,结果发现,由于气候变暖的原因,1996至2005年楚河流域的冰川面积共减少了154.7 km2。 关键词: 冰川;  变化监测;  Landsat-5 TM;  SAR     Abstract: This study extracted the local glacier information over the Nianchu river basin in the Tibet in 1996 and 2005 by using ice index,snow index and water index of Landsat TM\|5 multi\|spectral images,and Synthetic Aperture Radar (SAR)intensity and coherence information of ERS\|1/2 and Envisat ASAR.The optimized features were determined by their classification accuracies based on Support Vector Machine (SVM)classifier.The result showed that the composition of multi\|spectral and SAR features could effectively discriminate the water and ice from other types,with overall accuracies of 84% and 85% in 1996 and 2005,respectively.Based on the thematic information of these two years,the changes of the local glacial area and boundary were detected.The result showed that the glacial area of the Nianchu river basin was reduced by 154.7 km2,which mainly caused by the climate warming.

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