摘要
卫星雪盖信息的准确提取受到很多因素的影响,本文选用11幅玛纳斯河流域Landsat ETM+影像,应用归一化差值积雪指数NDSI区分积雪与其他地物,分析传感器增益、大气因素、地形效应对雪盖信息提取造成影响的原因,并定量计算各因素影响程度的大小。研究结果表明,成像过程传感器高低增益对卫星雪盖信息提取的影响非常大,大气因素的影响相对较小,NDSI对地形不具有适应性,尤其在阴影区进行积雪判读不适用。
The accuracy of satellite-derived snow cover information is affected by many factors.In this paper,we extracted snow cover information from Landsat ETM＋ scenes of Manas river basin using a normalized difference snow index（NDSI） and then analyzed its effect factors.Experiments showed that sensor＇s low-gain mode or high-gain mode has a great influence on the results of extraction of snow cover information.In addition,the atmospheric factors have minor impact on the results.NDSI does not have the adaptability to the terrain,especially in the shadow areas thus significant errors may be present when it is used to identify snow in the shadow areas due to effects of topography.
出处
《遥感信息》
CSCD
2011年第5期31-37,共7页
Remote Sensing Information
基金
新疆干旱区水循环与水利用重点实验室开放课题(XJYS0907-2009-04)
