中文摘要：

VIRR是FY-3卫星上搭载的遥感探测传感器之一。利用VIRR逐日数据进行区域雪情监测,首先对数据作辐射校正、几何校正等相应预处理,然后计算归一化积雪指数（NDSI）,并结合通道2、9反射率设定综合阈值进行积雪信息提取,并可利用降雪周期内逐日积雪数据去云处理,实现地区连续降雪最大雪盖统计以便于分析雪情。根据区域地面站实测数据对监测结果进行精度分析验证。研究表明,利用VIRR资料能够有效提取积雪信息,反映地区积雪实情,可推进国产卫星在灾害预警系统中的应用。

英文摘要：

VIRR is one of the remote sensing sensors equipped on the FY-3 satellite. Using VIRR data to monitor situation snow in Tibet region,firstly,the data were pretreated with radiometric calibration and geometric correction,and then the normalized difference snow index was calculated,it is achieved by setting comprehensive threshold to extract snow cover with reflectivity of Channel 2,9. At last,Cloud removal methodology from compositing daily data of snow,the largest snow cover area of continuous snowfall can be counted,and the monitoring result were verified with ground observation data. Research shows that the snow cover can be effectively extracted based on VIRR data,reflecting regional snow conditions,and promote the applications of domestic satellite in disaster warning system.