提高我国西南地区空三加密精度的几种方法.docxVIP

提高我国西南地区空三加密精度的几种方法 程婷婷，方源敏，贾培哲 ( 昆明理工大学 国土资源工程学院，云南 昆明 650093) 摘 要: 空三加密是航空摄影测量测图过程中至关重要的步骤，加密成果的精度直接影响了航测的成图质量。 我国西南地区地形复杂，多山地、林地，在地形起伏程度不同、航片质量有差异以及重力场分布不均匀等因素的 影响下，单纯用光束法区域网平差来控制空三加密的精度往往达不到要求。本文提出在使用光束法区域网平差 的同时，采取适当加密像控点、图像处理、提高加密点分布均匀度和卫星影像辅助的措施提高加密精度，参照国 家摄影测量方法成图标准，通过改变不同参数进行了多组加密对比实验。实验结果表明，经过改进后的加密方 法提高了加密精度，完全满足 1∶ 2 000 比例尺地形图测图要求，提高了 4D 产品的产出质量和效率。 关键词: 光束法区域网平差; 空三加密; 提高精度; PATB 中图分类号: P231． 4 文献标识码: B 文章编号: 1672 － 5867( 2014) 04 － 0216 － 03 Several Methods of Improving the Precision of Aerial Triangulation in Southwest China CHENG Ting － ting，FANG Yuan － min，JIA Pei － zhe ( College of Land Ｒesources Engineering，Kunming University of Science and Technology，Kunming 650093，China) Abstract: Aerial Triangulation is a very important step in the process of Aerophotogrammetry drawing，precision of Aerotriangulation is often directly affects the quality of the drawing． In southwest China is a varied topography，there are many mountains and forests，the factors，such as difference topography，different quality of Aerial Images and gravity of uneven distribution and so on，often effect the precision of Block Adjustment ． Simply using Block Adjustment to control the precision of Aerial Triangulation is often not up to the re- quirements． This paper proposes using Bundle Block Adjustment，at the same time，appropriate to increase the number of control points on the aviation imagery，image processing，improve the pass point distribution uniformity and satellite image auxiliary measures to improve the precision of the Aerial Triangulation． According to national standard measurement of Photogrammetry mapping，By changing different parameters to compare several experiments，the experimental results show that，the method after improvement can raise the accuracy of Aerial Triangulation． Fully meet the requirements of 1∶ 2 000 scale topographic mapping，improve the quality and efficiency of 4D production． Key words: bundle block adjustment; aerial triangulation; improve the prec