Belgium: Ghent University

Belgium: Royal Museum of Central Africa

Belgium: Université catholique de Louvain (UCL)

Belgium: Katholieke Universiteit Leuven (K.U. Leuven) 

China: Chinese Academy of Sciences (CAS)

France: University of Provence

Germany: University of Freiburg

Germany: University of Heidelberg

Ireland: University College Dublin (UCD)

Italy: National Research Council, Rome

Italy: Sapienza University of Rome

Poland: Institute of Geodesy and Cartography, Department of Remote Sensing (IGIK)

Spain: University of Valencia

Sweden: Swedish University of Agricultural Sciences (SLU)

Switzerland: Swiss Federal Institute of Technology Zurich (ETH Zurich)

USA: University of Maryland (UMD)