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。
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.
出处
《测绘与空间地理信息》
2014年第4期216-218,221,共4页
Geomatics & Spatial Information Technology
