1. a Geospatial Information and Remote Sensing (GIRS) Group, Faculty of Engineering and Surveying , University of Southern Queensland , Toowoomba 4350 QLD, Australia E-mail:
2. b Environmental Remote Sensing Group, CSIRO Land and Water , PO Box 1666, Canberra, ACT 2601 Australia
3. c Biophysical Remote Sensing Group, School of Geography, Planning & Architecture , University of Queensland , Brisbane 4072, Australia
4. d Mackay Sugar , Post Office Pleystowe , Pleystowe 4741 QLD, Australia