1. IABG Industrieanlagen-Betriebsgesellschaft, Hermann-Reicheltelt-Straße 3, 01109 Dresden, Germany
2. Department of Natural Resources, Faculty of Geo-Information Science and Earth Observation, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
3. Department of Water Resources, Faculty of Geo-Information Science and Earth Observation, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands