Determination of Image Orientation Supported by Imu and Gps

For operational use, the photo orientations of a block with more than 1000 images have been determined with an LCR88 inertial measurement unit (IMU) and GPS. The relation of the IMU to the camera and corrections for the GPS-data of the projection centers have been determined and improved by means of a small reference block with 5 – 8 photos. For checking purposes the photo coordinates of 252 photos have been measured and the orientations are determined by a combined bundle block adjustment with the GPS-data of the projection centers based on 9 control points. The achieved accuracy of the photo orientations based on IMU and GPS are sufficient for the creation of orthophotos but problems are still existing with y-parallaxes in the models. The yparallaxes can be reduced by a combined bundle block adjustment without control points or a more expensive inertial measurement system.