西南弱纹理林区提高空中三角测量精度方法

Study on Improving the Accuracy of Aerial Triangulation Methods in Southwest Weakly Textured Forest Region

作为空三加密中的重要内容,相对定向精度对空三成果质量至关重要。当前数字摄影测量中对地面目标的自动识别与提取主要依赖于对影像结构与纹理的分析[1],在西南云贵川地区山高林密,弱纹理区的相对定向精度难以控制,严重影响了空三加密和测图精度。本文根据项目经验,总结出弱纹理林区提高相对定向精度的一套流程方法,平差改进pos法+人工刺点方法在实践中效果良好。

As an important part of Aerial triangulation, relative orientation precision plays a key role in the quality. Automatic recog- nition and extraction of ground targets depends mainly on the analysis of the image structure and texture in current digital photograrn- metry. Relative orientation precision is difficult to control in Southwest of China, which high mountains with dense forests and weak texture. Based on the project experience, this paper summarizes a set of process methods to improve the relative orientation precision of weak textured forest region. POS adjustment improvement and artificial adding point method proved to be effective in practice.