GPS辅助光束法区域网平差像控布点方案在大比例尺航摄成图中的关键技术应用研究

Key Technologies Applied Research on the GPS-supported Bundle Block Adjustment Photo-control-point Layout Schemein the Task of Largescale Photographic mapping

随着航空摄影测量技术的不断发展,航摄成图在大比例尺地形图中的应用不断增加,但是常规的像控布点方案外业控制点工作量较大,并且空中三角测量的高程精度较难达到国家规范精度要求。本文通过对实际项目数据的分析,采用GPS辅助光束法区域网平差像控布点方案,使用Imagination软件进行机载GPS辅助光束法区域网平差之后,空中三角测量的精度(尤其是高程精度)能基本满足国家相关规范的精度要求。

Aerial photography plays an increasingly important role in the task of large-scale topographic mapping along with the continuous development of the aerial photogrammetry technology.However,the traditional photo-control-point layout scheme needs a lot of manpower and material resources,and the elevation accuracy of the aerialtriangulation can hardly meet the demands of the national standard.Through the analysis of the real project data,theImagination software is employed to handle the airborne GPS-supported bundle block adjustment in this paper,by which the accuracy of aerialtriangulation(especially the height accuracy)is completely meet the needs of the national standard accuracy requirements.