1. IIASA; Laxenburg; Austria
2. International Food Policy Research Institute; Washington; DC; USA
3. Felis; University of Freiburg; Freiburg; Germany
4. Fachbereich Geoinformatik; Fachhochschule Wiener Neustadt; Wiener Neustadt; Austria
5. School of Nature Conservation; Beijing Forestry University; Beijing; China
6. Geographic Information Science Center of Excellence; South Dakota State University; Brookings; South Dakota; USA