| GIS中伪随机数发生器选择策略研究 |
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| 引用本文： | 叶松.GIS中伪随机数发生器选择策略研究[J].测绘科学,2006,31(5):144-145,152. |
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| 作者姓名： | 叶松 |
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| 作者单位： | 武汉大学资源与环境科学学院,武汉,430079 |
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| 摘 要： | 采用伪随机数发生器(PRNGs)的随机方法被广泛应用于地理信息系统(GIS)中,如蒙特卡罗方法(MonteCarlo)、动态建模、随机模拟、元胞自动机等,因此随机模拟的有效性取决于伪随机数发生器的随机性能。GIS背景下,伪随机数发生器生成随机序列的质量对空间分析的影响,目前的文献中少有提及。本文基于现有伪随机数发生器(PRNGs)的统计特性分析,结合GIS应用的特点,探讨了伪随机数发生器的周期长度、相关性以及随机数序列的分布特征对空间分析的潜在影响,提出了GIS中伪随机数发生器的一般选取原则。
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| 关 键 词： | 随机方法 地理信息系统 伪随机数发生器 随机模拟 |
| 文章编号： | 1009-2307（2006）05-0144-03 |
| 收稿时间： | 2005-10-08 |
| 修稿时间： | 2005-10-08 |
Study on the selection strategy of PRNGs in GIS |
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| YE Song.Study on the selection strategy of PRNGs in GIS[J].Science of Surveying and Mapping,2006,31(5):144-145,152. |
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| Authors: | YE Song |
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| Abstract: | Some stochastic methods with pseudo-random number generators(PRNGs)are applied to GIS gradually,such as Monte Carlo techniques,dynamic modeling,stochastic simulation,cellular automata etc.Therefore the validity of stochastic analyses is dependent on the PRNG.Yet GIS article rarely discuss the impact of PRNGs within spatial analysis.Based on the statistic feature analysis of existed PRNGs and characteristic of GIS application,this article discusses the period length,correlation and structures as well as potential influence of random numbers' distributing feature to spatial analysis.It concludes a principle of PRNGs selection strategy. |
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| Keywords: | stochastic method GIS PRNGs stochastic simulation |
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