The dummy variables can only describe discrete changes in price indices, such as selling off-season dummy variable method will not be able to provide high precision analysis.
而虚拟变量只能描述价格指数的离散变化，比如在销售淡季虚拟变量法就不能提供精度较高的分析结果。
Most of the present change detection methods aim at land cover applications using low-resolution images, and generally can not meet the needs of high-precision analysis.
目前大部分变化检测研究主要集中在利用低分辨率卫星影像检测土地利用等宏观应用上，往往不能满足高精度分析的要求。
Most of the present change detection methods aim at land cover applications using low-resolution images, and generally can not meet the needs of high-precision analysis.
目前大部分变化检测研究主要集中在利用低分辨率卫星影像检测土地利用等宏观应用上，往往不能满足高精度分析的要求。
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