1. Western Australian Centre for Geodesy and the Institute for Geoscience Research, Curtin University; Western Australia Australia
2. Department of Cartographic Engineering; Universidade Federal de Pernambuco; Recife Pernambuco Brazil
3. Institute of Geodesy and Geoinformation, University of Bonn; Bonn Germany
4. Geodetic Institute, Karlsruhe Institute of Technology; Karlsruhe Germany
5. Institute of Physical Geography, Goethe-University Frankfurt; Frankfurt Germany
6. Biodiversity and Climate Research Centre and Senckenberg Research Institute and Natural History Museum; Frankfurt Germany