| 资源三号测绘卫星影像平面和立体区域网平差比较 |
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| 引用本文： | 汪韬阳,张过,李德仁,江万寿,唐新明,刘学林. 资源三号测绘卫星影像平面和立体区域网平差比较[J]. 测绘学报, 2014, 43(4): 389-395 |
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| 作者姓名： | 汪韬阳 张过 李德仁 江万寿 唐新明 刘学林 |
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| 作者单位： | 1. 武汉大学;2. 武汉大学测绘遥感信息工程国家重点实验室;3. 国家测绘局卫星测绘应用中心;4. 湖南省测绘科技研究所 |
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| 基金项目： | 国家科技支撑计划(2011BAB01B01;2012BAH28B04) |
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| 摘 要： | 针对弱交会条件下卫星遥感影像区域网平差无法正确求解的问题，本文提出了利用数字高程模型（DEM）作为高程约束的平面区域网平差方法提高其对地目标定位精度的策略。首先，选取带仿射变换项的有理函数模型（RFM）作为卫星影像平面区域网平差的数学模型。其次，在平差过程中更新连接点的地面坐标时仅求解地面点的平面坐标，高程值利用DEM进行内插获得。最后，在布设少量控制点的情况下通过平面区域网平差求解所有参与平差的卫星影像定向参数和连接点的地面平面坐标。利用两个地区的资源三号正视影像的平面区域网平差以及前正后三视影像的立体区域网平差的对比试验表明，对于资源三号卫星影像在1:50000DEM的支持下，平面平差可以达到和立体平差相当平面精度。对于近似垂直正视的资源三号影像，全球1km格网的DEM和90m格网的SRTM可以取代1:50000DEM作为高程控制，平面精度几乎没有损失。最终，试验结果证明了平面区域网平差方法的有效性和可行性。
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| 关 键 词： | 资源三号测绘卫星影像 立体区域网平差 平面区域网平差 精度 |
| 收稿时间： | 2013-12-17 |
| 修稿时间： | 2013-12-06 |
Comparative study of plane and stereo block adjustment for satellite imagery |
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| Abstract: | In response to the problem that block adjustment for satellite images cannot be solved with weak convergence geometric conditions, this paper proposed a plane block adjustment method that utilizing DEM as height constraint plane block adjustment method to improve the targeting precision of imagery. First, rational function model (RFM) with affine transformation is selected as the mathematical model of the satellite image plane block adjustment. Second, to update the ground coordinates of Tie Points (TPs), the plane coordinates of TPs were only solved in the adjustment process. Elevation values obtained using DEM interpolation. Finally, the plane coordinates of all TPs and orientation parameters of all satellite images were solved through plane block adjustment with a few Ground Control Points (GCPs). ZY-3 nadir images of two regions were tested for plane block adjustment and ZY-3 forward-nadir-back images of the same two regions were tested for stereo block adjustment. Comparison indicates that almost the same accuracy can be obtained by plane block adjustment support with 1:50000 DEM and stereo block adjustment for ZY-3 images. For ZY-3 nadir images, when global DEM with 1km grid and SRTM with 90m grid replaced 1:50000 DEM as elevation control, accuracy of plane block adjustment almost no loss. Ultimately, the test results proved the effectiveness and feasibility of the plane block adjustment method. |
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