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大气科学  2004 

卫星对地遥感应用中的邻近效应研究

DOI: 10.3878/j.issn.1006-9895.2004.02.14

Keywords: 邻近效应,卫星遥感,视反射率,水平非均一反射地表

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Abstract:

利用Monte-Carlo地气耦合辐射传输模式比较系统地进行了卫星视反射率对地表、大气和卫星参数的敏感性数值试验,重点研究了邻近效应对地表反射水平非均一分布的敏感性、邻近效应有效地表范围以及邻近效应与卫星高度的关系三个方面的问题.在定量分析的基础上,揭示了影响邻近效应的主要因子及其影响机制,给出了一些重要结论,包括:地表非均一引起的邻近效应的影响是非常重要的,特别是当目标反射率小于环境反射率时;气溶胶光学厚度越大,散射相函数对称性越强,卫星视反射率对环境反射率越敏趑感,邻近效应越明显;邻近效应的有效地表范围可达到几十公里,同样光学厚度条件下,与气溶胶相比,分子的有效地表范围更大,邻近效应也更强;卫星观测同一目标物时,邻近效应随着探测器高度增高而变大等.

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