Oleg Antropov, Matthieu Molinier, VTT Technical Research Centre of Finland, Finland; Ridvan Salih Kuzu, German Aerospace Centre, Germany; Lloyd Hughes, Marc Rußwurm, Devis Tuia, Ecole Polytechnique Federale de Lausanne, Switzerland; Octavian Corneliu Dumitru, German Aerospace Centre, Germany; Shaojia Ge, Nanjing University of Science and Technology, China; Sudipan Saha, Indian Institute of Technology Delhi, India; Xiaoxiang Zhu, Technical University of Munich, Germany