表碛覆盖冰川信息提取方法——以波密县为例  

Information Extraction Method of Debris-Covered Glaciers in Bomi County

作　　者：吴淼[1] 韩用顺[1,2] 张东水[2] 王欣[2] 格桑旺杰 

机构地区：[1]湘潭大学土木工程与力学学院,湖南湘潭411105 [2]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [3]西藏自治区公路局,西藏拉萨850015

出　　处：《山地学报》2017年第2期238-245,共8页Mountain Research

基　　金：交通运输部科技计划项目(20153161T906);岩土力学与工程安全湖南省重点实验室开放基金(16GES06);特殊环境道路工程湖南省重点实验室开放基金(kfj120404);湖南省研究生科研创新基金(CX2015B471)~~

摘　　要：针对表碛覆盖冰川提取困难的问题,本文结合TM影像、DEM和野外调查资料,基于地物光谱、地形和纹理特征,将研究区分为表碛覆盖冰川区、无表碛覆盖冰川区和阴影下冰川区,采用模糊逻辑方法建立定量化提取规则,综合利用了面向对象和波段比值两个方法的各自优点,建立面向对象-波段比值信息提取方法,进行了有无表碛物覆盖的冰川信息的分区提取,并以波密县为典型研究区,通过混淆矩阵进行精度分析。研究结果表明:1)提出的面向对象—波段比值法,能够较完整地提取研究区表碛覆盖冰川,精度可达93%,冰川信息提取总体精度为98%,kappa系数为0.97;2)研究区冰川总面积为7 655.27 km^2,占研究区总面积的46.18%,无表碛覆盖冰川、表碛覆盖冰川、阴影下冰川面积分别为5615.20 km^2、65.13 km^2、1 974.94 km^2,占总冰川73.35%、0.85%、25.80%。初步建立的表碛覆盖冰川自动信息提取方法可以为类似地区冰川遥感监测提供依据和参考。Aiming at the difficulty of extracting the debris-covered glaciers by means of remote sensing images, the ground object spectra, topographical characteristics and texture features of glaciers in different zones are determined according to TM images combined with DEM and field investigation data. Correspondingly,glaciers in Bomi County are divided into three glacial zones, including debris-covered glacier,no debris covered glacier and shaded glacier.The quantitative rules for extracting different glacial regions are established through fuzzy logic method, therefore the respective advantages of object-oriented and band-ratio methods are comprehensively utilized. Meanwhile, an auto- matic multi-subarea interpretation model, known as the object-oriented ＆ band-ratio model （abbreviated as OOBR model） ,is set up to extract diverse parts of glaciers rapidly. The precision of the extracted glacier information is tested with confusion matrix and field investigation data by taking the Bomi County as the typical case study area. The results show that：a）the proposed OOBR model is feasible to completely extract debris-covered glaciers in the study area with accuracy up to 93% and the overall accuracy of glaciers is up to 98% with the kappa coefficient to 0.97 ; b） the total area of glaciers is 77 655.27 square kilometers accounting for 46.18% of the total study area, and the areas of no debris covered glaciers,debris-covered glaciers and shaded glaciers are respectively 5615.20 square kilometers,65.13 square kilometers and 1974.94 square kilometers. It is better to draw the conclusion that the preliminarily established OOBR model can provide basis and references for remote sensing monitoring of glaciers in similar areas.

关 键 词：表碛覆盖冰川 面向对象-波段比值法 特征分区 快速信息提取 波密县 

分 类 号：P343.6[天文地球—水文科学]