1. School of Mathematical and Geospatial Sciences; RMIT University; GPO Box 2476 Melbourne VIC 3001 Australia
2. Cooperative Research Centre for Spatial Information, Level 5; 204 Lygon Street Carlton VIC 3053 Australia
3. ITC, University of Twente; PO Box 217 NL-7000 AE Enschede The Netherlands
4. Food and Agricultural Organisation of the United Nations; Viale delle Terme di Caracalla 00153 Rome Italy
5. Department of Environment, Water, Land and Planning; Victorian; PO Box 500 East Melbourne VIC 3002 Australia