基于ETM+的积雪提取方法研究——以新疆玛纳斯河流域为例

为了高精度地提取积雪信息, 消除森林覆盖区以及结冰河流水体对于积雪信息提取的影响, 以Landsat ETM+为数据源, 分析了玛纳斯河流域积雪信息提取的归一化差值积雪指数阈值, 并建立积雪信息提取方法. 对研究区进行了积雪信息提取, 并与国际数据服务平台所得的积雪信息提取结果进行了比较. 结果表明: 基于Landsat数据利用归一化差值积雪指数提取积雪信息时, 其合理阈值应为0.37; 通过总体精度以及Kappa相关系数在结冰水体区域以及森林覆盖区域的提取结果进行对比, 认定所使用的提取方法更加准确可靠.

Study of the snow cover extraction method based on ETM+data: Take Manas River basin as an example

In order to extract snow cover information high-precisely and to eliminate the impacts of the forest cover and the frozen river water on the extraction, in this paper, taking Landsat ETM+ data as resources, analyzing the threshold of NDSI to extract snow cover information in Manas River basin of Xinjiang, establishing the method of snow cover information extraction, the snow cover information in the study area was extracted and compared with the extraction results of snow cover information downloaded from international services platform at the same time. It is found that based on Landsat data to extract the snow cover information, the reasonable threshold of NDSI should be 0.37; the proposed extraction method in this paper is more accurate and reliable, which is firmly believed through overall accuracy and Kappa coefficients in the frozen river water areas and forest cover areas.