1. Naval Research Laboratory, Remote Sensing Division, Washington, DC, USA
2. NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
3. US Department of Agriculture, Agricultural Research Service, Southwest Watershed Research Center, Tucson, AZ, USA
4. US Department of Agriculture, Agricultural Research Service, Beltsville, MD, USA
5. Department of Civil Engineering, Monash University, Clayton, Australia