Le CGQ publie un article dans la revue Sensors
March 14, 2016

Le Centre de géomatique du QUébec, en collaboration avec l'Université de Sherbrooke, vient de publier un article portant sur le développement et l'évaluation d'un système de photogrammétrie par drone pour la modélisation envorinnementale 3D de grande précision.


Mozhdeh Shahbazi1, Gunho Sohn2, Jérôme Théau1 et Patrick Ménard3.


1 Département de géomatique appliquée, Université de Sherbrooke

2 Department of Earth and Space Science and Engineering, York University

3 Centre de géomatique du Québec


Résumé (en anglais)

The specific requirements of UAV-photogrammetry necessitate particular solutions for system development, which have mostly been ignored or not assessed adequately in recent studies. Accordingly, this paper presents the methodological and experimental aspects of correctly implementing a UAV-photogrammetry system. The hardware of the system consists of an electric-powered helicopter, a high-resolution digital camera and an inertial navigation system. The software of the system includes the in-house programs specifically designed for camera calibration, platform calibration, system integration, on-board data acquisition, flight planning and on-the-job self-calibration. The detailed features of the system are discussed, and solutions are proposed in order to enhance the system and its photogrammetric outputs. The developed system is extensively tested for precise modeling of the challenging environment of an open-pit gravel mine. The accuracy of the results is evaluated under various mapping conditions, including direct georeferencing and indirect georeferencing with different numbers, distributions and types of ground control points. Additionally, the effects of imaging configuration and network stability on modeling accuracy are assessed. The experiments demonstrated that 1.55 m horizontal and 3.16 m vertical absolute modeling accuracy could be achieved via direct geo-referencing, which was improved to 0.4 cm and 1.7 cm after indirect geo-referencing.


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