1. Mediterranean Agronomic Institute of Bari, 70010 Bari, Italy
2. National Authority for Remote Sensing and Space Sciences (NARSS), Cairo 1564, Egypt
3. Planetek Hellas, 15125 Athens, Greece
4. Planetek Italia, 70132 Bari, Italy
5. European Space Agency (ESA/ESRIN), 00044 Frascati, Italy