APPLYING INTEGRATED DGPS/IMU SYSTEMS TO STEREO PLOTTING

During recent years direct sensor orientation with GPS and IMU has gained popularity. The system can directly get exterior orientation elements without using ground control points. To achieve the full accuracy potential of direct sensor orientation, the compensation of systematic errors with the correct mathematical model and an optimum number of parameters for sensor calibration is required. However, experiments showed that there would be some problems with y-parallaxes of stereo models based on direct sensor orientation. In this paper we put up one method to resolve this problem. The method was the integration of GPS/IMU and (automatic) aerial triangulation (AAT) into bundle block adjustment, which was also called integrated sensor orientation. From experimental results, we could get some conclusions that direct sensor orientation currently allows the generation of orthoimages of the small image scale. But it is not always suitable for stereo plotting because of the large y-parallaxes in some models. To resolve this problem, the combination of GPS/IMU observations with ground control points (integrated sensor orientation) should be preferred in some cases