基于直线特征的遥感影像自动绝对定向

Automatic Absolute Orientation of Remote Sense Image by Line Photogrammetry

主要研究了道路自动提取和直线空间后方交会在遥感影像自动绝对定向中的应用,分析了用控制线代替控制点在后方交会中的优点,详细阐述了直线空间后交的几何关系并扩展了基于“共线方程”形式的误差方程式,实现了在已有矢量道路网基础上的道路自动提取。通过单幅航空影像绝对定向和高分辨率卫星影像外参数解算试验及精度分析,证明了本文算法和策略的正确性,为航空影像自动空中三角测量、多尺度遥感影像的配准提供了一个可行的方向。

This paper introduces an automatic approach for the exterior parameter calculation by matching extracted road from the image against the corresponding objects of an existing vector road map or a GIS database. The advantage of substituting control line for control point was analyzed. We have expatiated perspective geometry and coplanar constraint between the image space linear feature and the object space line segment in detail, and extended error condition equation. Within the study aerial imagery and remote sense image are exemplarily applied, whereas the topographic database of road net is vectored from map with the scale of 1∶10 000. The result shows that the registration of image data achieved pixel accuracy. Potential applications of the approach are manifold, like automatic aerotriangulation, multi scale remote sensing image registration, with some minor modifications.