1. Institute of Photogrammetry and Remote Sensing, Vienna University of Technology, Vienna, Austria
2. International GEWEX Project Office,Silver Spring, Md., USA
3. ESTEC, European Space Agency,Noordwijk, Netherlands
4. European Space Research Institute (ESRIN), European Space Agency, Frascati, Italy
5. Department of Environmental Sciences, Rutgers University, New Brunswick, N. J., USA
6. Hydrology and Remote Sensing Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Md., USA