Minimising systematic error surfaces in digital elevation models using oblique convergent imagery
Minimising systematic error surfaces in digital elevation models using oblique convergent imagery
复制标题
使用倾斜会聚图像最小化数字高程模型中的系统误差面
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
J. Chandler
中科院分区：
文献类型：
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作者：
R. Wackrow;J. Chandler
使用消费级数码相机的机会越来越多，特别是如果可以捕获精确的空间数据。拉夫堡大学最近进行的研究确定了数字高程模型（DEM）中可辨别的残留系统误差表面或圆顶。这些系统效应通常与这样的相机相关联，并且由稍微不准确的估计透镜失真参数引起。因此，开发了一种方法，最大限度地减少系统误差表面，使用一个温和的收敛的图像配置在垂直的角度。这种方法通过模拟和一系列实际测试进行了测试。本文研究了收敛配置的潜力，以尽量减少错误的表面，即使几何上更复杂的斜透视使用。最初，模拟数据被用来证明，一个倾斜的收敛图像配置可以最大限度地减少剩余的系统误差表面使用各种成像角度。此外，使用实验室测试场进行了实际测试，以验证模拟结果。由于需要开发一个系统来测量泛滥河流的地形表面，因此有机会利用真实的数据来验证模拟和实验室测试的结果。本文报道了模拟过程、实验室测试和实际测试的结果，表明斜会聚像位消除了由于透镜畸变参数不准确而引起的系统误差面。这种方法非常重要，因为通过消除对精确透镜模型的需求，它有效地提高了使用消费级数码相机获得的数字表面表示的精度。因此，仔细选择的图像配置可以为提高摄影测量获得的数据的质量提供新的机会。
There are increasing opportunities to use consumer‐grade digital cameras, particularly if accurate spatial data can be captured. Research recently conducted at Loughborough University identified residual systematic error surfaces or domes discernible in digital elevation models (DEMs). These systematic effects are often associated with such cameras and are caused by slightly inaccurate estimated lens distortion parameters. A methodology that minimises the systematic error surfaces was therefore developed, using a mildly convergent image configuration in a vertical perspective. This methodology was tested through simulation and a series of practical tests. This paper investigates the potential of the convergent configuration to minimise the error surfaces, even if the geometrically more complex oblique perspective is used. Initially, simulated data was used to demonstrate that an oblique convergent image configuration can minimise remaining systematic error surfaces using various imaging angles. Additionally, practical tests using a laboratory testfield were conducted to verify results of the simulation. The need to develop a system to measure the topographic surface of a flooding river provided the opportunity to verify the findings of the simulation and laboratory test using real data. Results of the simulation process, the laboratory test and the practical test are reported in this paper and demonstrate that an oblique convergent image configuration eradicates the systematic error surfaces which result from inaccurate lens distortion parameters. This approach is significant because by removing the need for an accurate lens model it effectively improves the accuracies of digital surface representations derived using consumer‐grade digital cameras. Carefully selected image configurations could therefore provide new opportunities for improving the quality of photogrammetrically acquired data.