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卫星反照率产品的多尺度验证与不确定性分析

, PP. 66-82

Keywords: MCD43B3,GLASS02,不确定性分析,验证,遥感,反照率

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Abstract:

?中低分辨率卫星反照率产品反映了局地与全球尺度地表吸收太阳短波辐射的能力,在气候变化与能量平衡研究中具有重要应用.卫星产品的精度通常基于地面观测值进行验证,而中低分辨率卫星反照率产品的验证需面对卫星与地面观测尺度的差异这一难题.引入高分辨率反照率作为尺度转换桥梁是一种常用验证策略,但高分辨率反照率数据本身的误差,以及它与地面观测、中低分辨率产品的互匹配都可能给验证结果带来不确定性.本文验证策略对这些不确定性进行了控制:以不确定性最小原则设计地面采样策略,用地面观测值对30m分辨率反照率(用国产HJ-1a/b卫星数据反演得到)进行了校正,用校正后的30m反照率升尺度后,选择不确定性更小的像元评价中低分辨率反照率的精度.以中国黑河流域中游为研究区开展了对GLASS和MODIS两种1km分辨率反照率产品的验证试验.验证结果表明,尺度转换后的HJ反照率可以精确的检验低分辨率反照率产品的精度,但是必须考虑验证过程中的不确定性,并在验证时排除不确定性过大的像元.

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