DEOS - Department of Earth Observation and Space Systems, TU Delft, Kluyverweg, 1, Delft, 2629 HS Netherlands; DI - Department of Science Computers, UBI, R. Marques d'Avila e Bolama, Covilhã, 6201-001 Portugal
DEOS - Department of Earth Observation and Space Systems, TU Delft, Kluyverweg, 1, Delft, 2629 HS Netherlands
DEOS - Department of Earth Observation and Space Systems, TU Delft, Kluyverweg, 1, Delft, 2629 HS Netherlands
OAUP - Astronomical Observatory, University of Porto, Monte da Virgem, V. N. Gaia, 4430-146 Portugal
Institute for Geodesy, University of the Bundeswehr Munich, Neubiberg, Neubiberg, 85577 Germany