1. Department of Civil and Environmental Engineering, University of Surrey, Guildford GU2 7XH, UK
2. Institute of Geomatics, University of Natural Resources and Life Sciences, Vienna, Peter-Jordan Strasse 82, 1190 Vienna, Austria
3. Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 16500 Prague, Czech Republic
4. UK Centre for Ecology and Hydrology, Environment Centre Wales, Deiniol Road, Bangor LL57 2UW, UK
5. National Infrastructure Laboratory, Engineering and Physical Sciences, University of Southampton, Boldrewood Campus, Southampton SO16 7PP, UK