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测绘学报  2013 

稀少控制下机载InSAR区域网联合地理编码方法

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Keywords: 机载InSAR,斜距高程图,地理编码,相似变换,绝对定向,区域网平差

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Abstract:

针对机载InSAR未经地理编码的斜距高程图,提出了机载InSAR斜距高程图绝对定向模型,用于定位和地理编码。模型利用斜距的高程信息进行斜地距转换,消除影像像点之间相对位移,然后将转换后的地距高程图视为刚体,进行相似变换,转换到物方空间坐标系下,从而建立由影像坐标和相对高程信息到地面三维坐标的映射关系。在绝对定向模型的基础上,以每个地距高程图作为单元模型,利用各单元模型彼此间的公共点连成一个区域,利用少量的控制点进行区域网平差,求得各模型的定向参数和加密点的坐标,实现稀少控制下的机载InSAR多片联合地理编码。利用我国西部横断山脉地区三个条带2.5m分辨率的机载InSAR数据组成区域网进行平差试验,利用光学卫星影像加密的已知点作为平差控制点和检查点,通过对多种控制点布设方案进行比较确定区域网平差控制点布设方案,结果显示在9个控制点的情况下精度趋于稳定,满足150000测图要求。

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