高性能大气校正算法中遥感数据切分策略研究
高分辨率卫星遥感数据在地物识别等方面具有明显优势,然而其定量化应用中需要精确的大气校正,该过程通常相当耗时。分别研究了大气校正算法串行处理方法及基于通用计算机集群系统的并行处理过程。通过对2012年7月我国华北地区的环境卫星CCD数据进行大气校正,并分析了串、并行过程各个步骤运行时间,表明了对大气校正并行处理的高可行性。针对并行过程中负载不均衡和通讯频繁等问题,设计了基于卫星像元特征的数据切分策略,并对不同并行算法进行了性能分析,表明了本文反演结果的可靠性,以及提出的切分策略能达到更高的加速比。...
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Published in | 计算机工程与科学 Vol. 38; no. 5; pp. 857 - 862 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
中国科学院遥感与数字地球研究所遥感科学国家重点实验室,北京 100101
2016
信阳职业技术学院数学与计算机学院,河南信阳 464000%中国科学院遥感与数字地球研究所遥感科学国家重点实验室,北京,100101 |
Subjects | |
Online Access | Get full text |
ISSN | 1007-130X |
DOI | 10.3969/j.issn.1007-130X.2016.05.003 |
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Summary: | 高分辨率卫星遥感数据在地物识别等方面具有明显优势,然而其定量化应用中需要精确的大气校正,该过程通常相当耗时。分别研究了大气校正算法串行处理方法及基于通用计算机集群系统的并行处理过程。通过对2012年7月我国华北地区的环境卫星CCD数据进行大气校正,并分析了串、并行过程各个步骤运行时间,表明了对大气校正并行处理的高可行性。针对并行过程中负载不均衡和通讯频繁等问题,设计了基于卫星像元特征的数据切分策略,并对不同并行算法进行了性能分析,表明了本文反演结果的可靠性,以及提出的切分策略能达到更高的加速比。 |
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Bibliography: | remote sensing;atmospheric correction;aerosol optical depth;data division;balanced loads BAI Lian-hong ,XU Shu ,SI Yi-dan ,LI Shen-shen (1. State Key Laboratory of Remote Sensing Science,Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences,Beijing 100101;2. The School of Mathematics and Computer Science, Xinyang Vocational and Technical College,Xinyang 464000,China) 43-1258/TP High-resolution satellite data is of powerful potentiality in applications such as surface ob- ject identification. However, the related quantitative remote sensing usually requires an accurate atmos- pheric correction, which is quite time-consuming. The serial and parallel processing of atmospheric cor- rection in the PC-based cluster system is studied. The atmospheric corrections of H J-satellite CCD data over North China Plain in July 2012 are shown in this paper, and the execution time of each step in the serial and parallel processing is also analyzed, which proves the high feasibility of atmospheric correction p |
ISSN: | 1007-130X |
DOI: | 10.3969/j.issn.1007-130X.2016.05.003 |