摘要
在航天测绘时,小基高比立体测绘可以较好地避免大基高比的不利因素,有效减弱遮挡、辐射差异、几何畸变和阴影等因素对测绘精度的影响,在城市立体测绘中具有更多的优势。小基高比立体测绘需要对基高比数据值的优化设计进行研究,文章通过仿真分析了影响小基高比立体测绘高程精度的主要因素,搭建了不同密度和高度建筑物的场景,进行了不同基高比和噪声的仿真成像,最终结果表明,基高比、场景、遮挡以及噪声的不同均会对测绘精度产生影响;当地物目标高程越高、场景越复杂时,其最优基高比越小,而由噪声造成的误差越大。
A small-baseline stereo configuration can alleviate the problem caused by wide-baselines. Small-baseline can reduce effectively the influences on survey accuracy of occlusion, radiation difference, geometric distortion and shading, which is much meaningful for metropolis stereo surveying. It is mecessary to study the optimization of baseline. A computer simulation experiment is introduced in this paper, to study the main factors that influence the accuracy of the elevation. The scence with buildings of different heights and densities is obtained to study the noise sensibility by adding independent white noises and the algorithm behavior depending on the baseline. The simulation results show that the different baseline, scene, shading and noise all can influence survery accuracy, and the optimum baseline will be small and noise error large when the earth object DEM is high and the scene complicated.
出处
《航天返回与遥感》
北大核心
2016年第5期95-101,共7页
Spacecraft Recovery & Remote Sensing
基金
国家重大科技专项工程
关键词
小基高比
立体测绘
仿真分析
航天遥感
small-baseline
stereo surveying
simulation analysis
space remote sensing
