Abstract
The regular inspection of the crane tracks of storage cranes at the Container Terminal Altenwerder (CTA), Hamburg requires high accuracy of measurements to determine its position. The allowed tolerances are in the range of 10 mm in the XY plane on a track length of 300 m. The traditional semi-automatic surveying methods are slow and require the interruption of the activities in the storage blocks. The research project AeroInspekt proposed a fully automatic measurement of the position of the tracks using UAV-based photogrammetry. In this paper, the results of the test campaign, carried out in June 2020, were presented where different cameras (150 mm and 80 mm telelens) and flight speeds (1.1 m/s and 1.9 m/s) at a 35 m flying height were performed. Furthermore, an automated rail delineation in the derived surface model was developed and evaluated with ground reference measurements. The results show that the required accuracy of the rail position with an RMSE of 3 mm in XY plane and 8 mm in altitude can be achieved with comparatively less disruption of regular block activities.
Highlights
The Container Terminal Altenwerder (CTA) is a highly automated terminal located in Hamburg and contributes heavily to transport through the shipping industry
This paper presented the results of the final test campaign of the research project
AeroInspekt for automatic measuring of the crane tracks using a high-resolution medium format camera system installed on a multicopter
Summary
The Container Terminal Altenwerder (CTA) is a highly automated terminal located in Hamburg and contributes heavily to transport through the shipping industry. Traditional semiautomatic methods for surveying the exact rail location are very complex and costly They are associated with a residual risk in terms of occupational safety and lead to container storage areas being closed for a day, which can lead to corresponding operational and capacity losses. 2021, 13, 384 camera components, the design and realization of a very high-quality geodetic control network, the development of a suitable ground marking concept, the systematic planning and execution of the flight and photogrammetric bundle block adjustment and an automatic delineation of the rails from derived height models and ortho images. Details of the network measurement and the improvements that have been carried out, which is necessary for the positioning of the ground control points, are explained. Chapter seven deals with the results obtained, before the paper is concluded
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