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冰川冻土  2014 

中国稳定积雪区IMS雪冰产品精度评价

DOI: 10.7522/j.issn.1000-0240.2014.0060, PP. 500-507

Keywords: IMS雪冰产品,精度评价,积雪遥感,稳定积雪区

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Abstract:

IMS雪冰产品由多种光学与微波传感器数据融合而成,提供北半球每日无云的积雪范围,在积雪遥感研究中具有广阔的前景.以气象站实测雪深数据为真值,检验了2009-2010年IMS雪冰产品在中国三大稳定积雪区北疆、东北、青藏高原地区每月、积雪季以及全年的误判率、漏判率和总体准确率,并分析了IMS雪冰产品的准确率与雪深之间的关系.结果显示IMS雪冰产品的年总体准确率在三大积雪区均超过了92%,积雪季总体准确率均超过了88%,利用IMS雪冰产品监测积雪范围是可靠的.然而,IMS雪冰产品精度具有区域差异性,北疆地区在1月和2月误判率偏高,青藏高原地区积雪季有严重的漏判现象.IMS雪冰产品的准确率在东北地区和北疆地区随着雪深的增加而升高,当东北地区雪深超过6cm,北疆地区超过13cm时,准确率接近100%,但是,青藏高原地区两者基本没有关系.通过在青藏高原地区与同时相的4景MODIS积雪产品对比分析发现,实际上IMS雪冰产品相对地高估了积雪面积,青藏高原地区漏判率高其原因是IMS对零碎积雪的识别能力不足并且气象站分布不均匀.

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