1. GeoVISTA Center, Department of Geography, The Pennsylvania State University, University Park, PA, USA
2. School of Geography and Sustainable Development, University of St Andrews, St Andrews, Scotland
3. School of Surveying, University of Otago, Dunedin, New Zealand
4. Esri, Inc, Redlands, USA
5. Division of GIScience, University of Gävle, Gävle, Sweden
6. Department of Geoinformation Processing, Faculty of Geoinformation Science and Earth Observation, University of Twente, Enschede, The Netherlands
7. Department of Geomatics, Universidade Federal do Paraná, Curitiba, Brazil