低空大比例尺地形图航测生产关键技术

Research on the key technology of large scale mapping from low altitude photogrammetry

针对传统航空摄影测量生产工艺在生产过程中遇到的影响大比例尺测图精度的问题,该文探讨了低空航测生产大比例尺地形图的关键技术。通过选用宽角相机、低航高飞行、强化影像匹配、野外布设标志控制点、优选平差模型、精化测图操作等改进方式,以提高大比例尺航测精度;组建无人飞艇低空航测系统,对提出的技术方法予以实现;最后给出了山西境内近30个县市建成区1∶500测绘生产实践的部分验证成果。

In this paper,based on the theoretic accuracy analysis of large scale photogrammetric mapping,some defects in traditional procedure were discussed;a set of key technology dedicate to the low altitude photogrammetry was described in detail,including selecting the wide angle camera,lower flight,enhanced image matching,the field distribution of measuring mark point,preferably adjustment model,and refined mapping operation.Then, a low altitude aerial unmanned airship system was established.Finally,the proposed method was verified through the production practice of 1∶500 DLG surveying and mapping in 30 counties in Shanxi province.