1. Institute for Electromagnetic Sensing of the Environment (IREA),National Research Council of Italy (CNR),Bari,Italy
2. Council for Agricultural Research and Analysis of Agricultural Economics (CREA),Centre for Cereal and Industrial Crops (CI),Foggia,Italy
3. Microwaves and Radar Institute,German Aerospace Center (DLR),Wessling,Germany
4. European Space Agency (ESA),Earth and Mission Science Division,Noordwijk,The Netherlands