摘要
精确提取冰川的轮廓对于计算冰川的面积至关重要。对比分析了3种冰川提取方法。结果表明:最大似然法由于很难将阴影内部的冰川提取出来,所提取的冰川面积偏低;波段运算法的比值法、NDSI法与目视解译法所提取的冰川面积接近,但是目视解译法费时费力;基于NDSI波段运算方法具有运算速度快、结果准确和算法简单等优势。基于NDSI方法提取希夏邦马峰地区的冰川变化结果表明,1990—2010年期间该地区冰川面积在不断退缩,并且有加剧的趋势。
Accurate glaciers outline is crucial for the calculation of the area of glaciers. Three methods of glacier extraction were analyzed and compared. As it was difficuh to extract glacier by using the maximum likeli- hood classification when the glacier was located in the shadow, so its result was lower than the others. The result of visual interpretation was close to the other methods. But it was time-spending and effort-consuming for visual inter- pretation. Band computing method based on NDSI has the advantages of fast calculating speed, accurate result and simple algorithm. The glacier of Mountain Xixabangma was extracted by NDSI methods and the resuhs showed that the glacier area was retreating continually from 1990 to 2010 with increasing trend.
出处
《地域研究与开发》
CSSCI
北大核心
2013年第6期154-158,共5页
Areal Research and Development
基金
国家高技术研究发展计划(863计划)项目(2012AA12A310)
关键词
冰川提取
最大似然分类法
比值法
波段运算法
glacier extraction
maximum likelihood classification
ratio method
hand computing method
