Aerial Data Acquisition for Disaster Management: Exploiting the Potential of Integrated Sensor Orientation

摘要

Aerial photogrammetry is an efficient technique for data acquisition over large areas.The georeferencing of aerial images often relies on the availability of ground control information.The requirement for the field measurement of ground control points is a limiting factor in the application of aerial photogrammetry as a rapid response data acquisition technique for crisis management.In recent years,the integration of GPS and INS has provided the opportunity of georeferencing aerial images without ground control,by directly measuring the position and attitude of the camera at the time of photography.In this paper,we investigate the accuracy potential of an integrated orientation approach for the georeferencing of aerial images without control points.Experimental results demonstrate that improved accuracy in image space can be achieved by the integrated orientation approach when a larger number of tie points is introduced in the adjustment process.Also,it is shown that variations in the initial weights for the tie points and GPS/INS measurements result in variations of the errors in both image and object space.The dependence of accuracy on the initial weights suggests that variance component estimation should be seen as a necessary process in the integrated orientation approach.