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基于快速傅里叶变换的ASTER与SRTM有效融合研究

DOI: 10.6046/gtzyyg.2010.04.05, PP. 19-22

Keywords: ?快速傅里叶变换,DEM,精度,SRTM,ASTER

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Abstract:

?为了克服两种向全球开放的、不同数据源(ASTER和SRTM)DEM的获取技术缺陷,以甘肃省东部董志塬某测区为例,研究两种来源DEM的有效融合方案。首先,借助快速傅里叶变换(FFT)将ASTER和SRTM的DEM数据由空域转换到频域;然后,分别基于高通和低通滤波器进行滤波处理,并将滤波后的频域相加;最后,基于FFT逆变换将融合后的频域转换到空域,实现DEM数据的有效融合。误差分析表明:融合后的DEM最小、最大误差较融合前的均有明显降低,中误差也有降低趋势,误差绝对值大于30m的网格点数占全部网格数的比例均有所下降。

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