1. Université Libre de Bruxelles (ULB),Department of Geosciences, Environment and Society,Brussels,Belgium
2. Public University of Navarre,Department of Engineering,Pamplona,Spain
3. University of Twente,Faculty of Geo-Information Science and Earth Observation (ITC),Enschede,The Netherlands
4. Karlstad University,Faculty of Health, Science and Technology,Department of Environmental and Life Sciences, Geomatics,Karlstad,Sweden