稀少控制下机载InSAR区域网联合地理编码方法

摘要/Abstract

摘要： 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1:50 000测图要求。

关键词: 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

Abstract: This paper proposed an absolute orientation model for slant-range elevation map of airborne InSAR which is not geocoded. At first, the model converts slant-range elevation map to ground-range elevation map according to elevation of the map, so relative displacement between image points can be eliminated. Then ground-range elevation map as a rigid body is transformed to map in geographic coordinate system by similarity transformation. So geocoding can be realized with the mapping between point of elevation map and ground point. On the basis of absolute orientation model, a block is made up with multiple ground-range elevation maps as cell models using common points of neighbor model. Then model orientation and solution for geographic coordinates of common points can be completed by block adjustment, and combined geocoding of multiple elevation maps can be realized. Experiment was carried out with airborne InSAR data containing three strips and located at Hengduan Mountain area of Western China. The resolution is 2.5m. The orientation points and check points were derived from block of spaceborne optical images. Distribution scheme of orientation points was determined with comparison of several different schemes. The results showed that the accuracy trended to be stable with nine orientation points and meet the need of topographic mapping at scale of 1:50 000.

Key words: airborne InSAR, slant-range elevation map, geocoding, similarity transformation, absolute orientation, block adjustment

中图分类号:

P231

黄国满杨书成张继贤赵争. 稀少控制下机载InSAR区域网联合地理编码方法[J]. , 2013, 42(3): 0-0.

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