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冰川冻土  2013 

基于HJ-1B数据的积雪制图NDSI阈值分析——以祁连山积雪为例

DOI: 10.7522/j.issn.1000-0240.2013.0074, PP. 648-655

Keywords: 环境减灾卫星,积雪,阈值,Khat系数

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Abstract:

环境减灾卫星是我国于2008年发射的用于环境与灾害监测预报的小卫星星座,相对于气象卫星传感器,其空间分辨率有了较大提高.以祁连山积雪为研究对象,利用环境减灾卫星HJ-1B星开展积雪提取监测研究,分别对不同区域、不同高程的积雪区进行积雪提取,以同时期LandsatETM+影像中提取的积雪面积为标准,对环境减灾卫星NDSI阈值的选取进行研究分析,以确定适合于HJ-1B提取积雪的阈值;同时利用不同季节的HJ-1B积雪数据进行验证,用Kappa检验阈值的精度.研究表明HJ-1B积雪制图的阈值为NDSI≥0.24,b2>0.13,b4>0.15;其中,在海拔3000~4000m区域NDSI阈值大于0.25,海拔4001~5000m区域NDSI阈值大于0.45,海拔5000m以上区域NDSI阈值大于0.5;利用Kappa检验阈值精度,Khat系数均高于90%,说明该研究确立的HJ-1B数据提取积雪的NDSI阈值合理有效.

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