High-quality Geo-referencing of Gps/imu-supported Multi-spectral Airborne Scanner Data – Experiences and Results

For the work programme BIOTOPMONITORING VIENNA of the Austrian Health Institute, multi-spectral air-borne scanner data have been recorded in the intention of automation supported identification and classification of forests and green urban areas in Vienna. Before multi-spectral and textural image analysis can be performed, the scanner data have to be geometrically rectified (georeferenced) with respect to a map projection system. The geo-referencing of the GPS/IMU-supported scanner data of the surveying flight Vienna 2000 was carried out at the Institute of Photogrammetry and Remote Sensing of the Vienna University of Technology. In the course of the geo-referencing process "drift-phenomena" within the GPS/IMU-data were detected, which decrease significantly the quality of the geo-referenced scanner data. In this paper principles of geo-referencing of GPS/IMU-supported multi-spectral air-borne scanner images are outlined. Furthermore it is presented, how possibly occurring drift-phenomena within GPS/IMU-data can be corrected or at least dampened by a hybrid adjustment applying an extended mathematical model and by providing additional controland tie-information. * Corresponding author: email since August 01, 2002: [email protected]