1. Institute of Geophysics and Geoinformatics TU Bergakademie Freiberg Freiberg Germany
2. National Research Institute of Astronomy and Geophysics (NRIAG) Cairo Egypt
3. Faculty of Geo‐Information Science and Earth Observation University of Twente Enschede The Netherlands
4. Institute of Geoscience Christian‐Albrechts‐University Kiel Kiel Germany