FY-3/VIRR资料积雪多阈值综合判识方法研究

利用卫星遥感监测积雪分布相比地面观测具有明显优势,目前基于FY-3卫星数据在积雪监测方面的研究较少。借鉴现有积雪卫星遥感监测算法,研究出适用于FY-3/VIRR资料的积雪判识方法,利用归一化积雪指数和多波段综合阈值实现积雪判识,提取积雪信息生成区域二值化积雪分布图。通过实例分析验证算法有效可行,并与MODIS积雪产品MOD10及其L1B数据NDSI判识结果进行对比,说明算法判识结果良好。研究表明,FY-3卫星数据可作为积雪遥测的可靠资料来源,可延用于积雪监测与灾害预警业务系统中,促进国产卫星数据的应用与推广。

Method of Snow Multi-threshold Comprehensive Discrimination with FY-3/VIRR Data

Monitoring the distribution of snow coverage via satellite remote sensing has an clear advantage over surface observation.And a few studies have been carried out about snow monitoring based on FY-3 data.A snow-discriminating method applying to FY-3/VIRR data with snow-satellite remote sensing monitoring algorithm is provided which is achieved by normalized difference snow index and multi-band comprehensive threshold,and regional snow cover classification maps are extracted.This algorithm is proved to be effective and feasible by case analysis,and results comparisons are carried out with MODIS snow products MOD10 and its first level data identification results,which demonstrated this algorithm has dominant discriminating results.The study shows that FY-3 data is a reliable source of snow telemetry and can be used in snow monitoring and disaster predictive warning service,which facilitates the application and popularization of domestic satellite.