1. German Aerospace Center (DLR), Earth Observation Center,Photogrammetry and Image Analysis Department,Oberpfaffenhofen,Germany
2. Starion Group c/o European Space Agency (ESA),Frascati,Italy
3. Telecommunications Group,Center for Research and Advanced Studies of the National Polytechnic Institute (Cinvestav),Zapopan,Mexico
4. German Aerospace Center (DLR), Earth Observation Center,Photogrammetry and Image Analysis Department,Berlin,Germany