摄影测量测图的全数字化道路

摄影测量自动化可以通过数字化来实现。然而,大量数据处理的速度和影象相关的可靠性却是有待解决的关键问题。本文提出的全数字化测图方案具有如下特点:(1)有效地利用空中三角测量资料于数字影象定向和灰度的核线排列,从而减轻计算工作量;(2)兼顾可靠性与精度两方面,采取了合理的二维目标区形式;(3)采用多重判据的新方法代替通常的单一判据,以获取可靠的影象区配;(4)通过视差信号处理剔除粗差;(5)可在数字纠正制作正射影象地图中加入汉字注记。

A Digital way for Photogrammetric Mapping

The automation of photogrammetry can be realized thorough digital way.However,the speed of processing a vast amount of data and the reliability of image correlation are the key problems awaiting solution.The image digitizing mapping system proposed in this paper includes the following distinguishing features.(1)For the orientation of digitized images and the arrangement of sampled pixels along epipolar lines,data from aerial triangulation are effectively used thus,the computation load has been greatly reduced,(2)Considering both reliability and aceuracy in the digital correlation,an appropriate twodimensional target segment is suggested.(3)In order to get more reliable image matching,a new method,so called mufti-criterions method,is used in place of the generally adopted single criterion one.(4)The gross errors are detected by parallax signal processing.(5)Chinese character notes can be printed on orthophoto maps during digital rectification.