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光学遥感源MODIS具有高光谱分辨率、高时间分辨率、高空间分辨率、全球范围内免费接收等优势,被广泛应用于洪涝、干旱、森林草原火灾、雪灾等自然灾害的动态监测领域。MODIS数据用于内蒙古草原积雪监测,提取积雪信息在国内尚属空白。本文利用MODIS L1B 500m分辨率数据,经过几何校正、去“双眼皮”预处理,根据归一化差分积雪指数(NDSI)算法和综合阈值判别法对内蒙古自治区2008年1月下旬大范围降雪进行积雪信息提取,制作积雪覆盖图。利用内蒙古生态与农业气象中心发布的雪情遥感监测信息验证积雪覆盖图的准确度。验证结果表明,MODIS数据用于大范围积雪监测非常有效。
Optical Remote Sensing MODIS is widely used in the dynamic monitoring of natural disasters such as floods, droughts, forest grassland fires and snowstorms because of its advantages of high spectral resolution, high temporal resolution, high spatial resolution and free reception around the world. MODIS data is used to monitor the snow cover in the grassland of Inner Mongolia, and the snow information is still blank in China. In this paper, using MODIS L1B 500m resolution data, after geometric correction, go to the “double eyelid” pretreatment, according to the normalized differential snow index (NDSI) algorithm and comprehensive threshold discriminant method to the Inner Mongolia Autonomous Region in late January 2008 Snowfall snow information extraction, making snow cover map. Using the snow remote sensing monitoring information released by Inner Mongolia Ecology and Agrometeorological Center to verify the accuracy of snow coverage map. Verification results show that MODIS data is very effective for a wide range of snow cover monitoring.