Professor Zhang Kefei was a guest at Institute of Geodesy and Geoinformatics during September 13-20, 2013. He is a Director of the Satellite Positioning for Atmosphere, Climate and Environment (SPACE) Research Centre at RMIT University, Melbourne, Australia. During his visit to our University, on September 18, Prof. Kefei gave a lecture for academic staff, students and invited guest from outside of the University. The presentation “GNSS for Atmosphere Sounding – the Road Ahead” describes recent trends in remote sensing of the troposphere and some preliminary results of research carried out in RMIT.