PERFORMANCE ANALYSIS OF FAST AT FOR CORRIDOR AERIAL MAPPING

Abstract. Nowadays most airborne photogrammetric and remote sensing systems are equipped with GNSS receivers and inertial sensors that allow the use of various orientation methods: from Direct Sensor Orientation (DiSO) to Integrated Sensor Orientation (ISO), all the way to "Fast Aerial Triangulation" (Fast AT), a new orientation method recently proposed by the authors of this paper. On the one hand, DiSO is the fastest method. It only needs the INS/GNSS time-position-attitude aerial control information and the previously calibrated system constants as the lever-arm vectors and boresight matrices. On the other hand, ISO is the most accurate and robust orientation and calibration method. It uses all the available information: a large number of image coordinates, some ground control points and the INS/GNSS time-position-attitude aerial control information. Fast AT is a new orientation method that combines the image measurement of few ground control points, the coordinates of these ground control points and the time-position-attitude aerial control information. Fast AT is clearly an alternative to DiSO, even an alternative to ISO depending on project specifications. Our preliminary results with regular blocks indicate that Fast AT performances are closer to the ISO than to the DiSO results. In the light of the good results for block aerial mapping, in this paper we investigate Fast AT performance for corridor aerial mapping: we briefly review the concept, discuss its geometry and analyse its potential for corridor aerial mapping.