The mid and long term forecast model based on the time series analysis has a good forecast effect.

建立在时间序列分析基础上的中长期预报模型具有很好的预报效果，可以用于作业预报。

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For viewshed analysis based on DEM database, the algorithm having a good experimental effect reduces obviously the frequency of access to database with lower time complexity.

对基于DEM数据库的可视域分析，该算法在时间复杂度较低的情况下大大减少了访问数据库的次数，取得了很好的效果。

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A new analysis method based on theoretical statistic models was proposed to analyze finite word-length effect, instead of the complicated and time-consuming sample statistics process.

理论统计模型分析的新方法的基础上，提出了有限字长效果进行分析，而不是复杂和费时的样品统计过程。

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