POS技术在数码航摄影像制作DOM中的应用

Application of POS Technology in Producing DOM from Digital Aerial Images

数字信息时代,正射影像图(DOM)已被认为是生成及支持GIS数据库地理信息所必须的最理想参照图像背景,如何高效而精准地生产DOM是亟待解决的问题。采用POS(DGPS/IMU)技术制作DOM,能够节省大量的外业控制点,这对提高航测地形图生产效率,降低成本具有重要意义。本文以浙江武义县城区1∶2 000 DOM的生产为例,介绍POS辅助航空摄影测量技术在实际生产中的技术流程和方法。并通过精度分析表明,利用POS辅助的DOM生产,完全可以满足1∶2 000正射影像成图精度要求。

In the era of digital information,Digital Orthophoto Map（ DOM） has been viewed as the ideal referential image background. How to produce DOM effectively and accurately is a problem demanding prompt solution. Producing DOM by POS（ DGPS /IMU） technology can save a lot of field control points,which is of important meaning to improve the efficiency of producing aerial photographic map and decrease the cost thereof. Taking the production of 1∶ 2 000 DOM of Zhejiang Wuyi as an example,this article introduces the practical technique flow and methods of POS- assisting aerial photography surveying technology. It also proves by accuracy analysis that production of DOM with the assistance of POS can fully satisfy the accuracy requirement of 1 ∶ 2 000 for orthophoto map.