Geometric Processing of High Resolution Airborne Scanner Imagery Using Gps-ins and Ground Control Points

The registration and geometric recti cation of airborne scanner imagery is an essential prerequisite for the processing and analysis of this type of images. The Digital Photogrammetric Assembly (DPA) is an airborne camera consisting of three pan-chromatic line arrays for stereo imaging and four line arrays for multi-spectral imaging. For georeferencing the sensor system is completed by a module consisting of a GPS and a Inertial Navigation System (INS). Additionally due to the stereo capability of the camera error terms for position and attitude can be obtained by photogrammetric constraints utilizing ground control points and corresponding image points. In order to get the highest possible accuracy and to simultaneously reduce the number of necessary ground control points, position and attitude are determined by integrating all available information (GPS, INS and stereo image data). After this step the image data is recti ed in order to eliminate distortions caused from attitude and position variations of the scanner during the ight. This step is a prerequisite for the band-to-band registration of the multi-spectral channels and the generation of epipolar images which are required for stereoscopic measurement or stereo image matching. Within the article the geometric processing of the high precision and high resolution scanner imagery will be described and results of the performed test will be presented.