Acknowledgements
This special issue resulted from a technical session run by the TC Working Group II/6 Geographical Visualisation and Virtual Reality at the 22nd ISPRS Congress, held in Melbourne 25th August to 1st of September, 2012. A number of the participants we invited to extend their papers and also there was a public call for papers. We would like to thank the organisers of this Congress including: Cliff Ogleby, Chris Bellman, Simons Jones and Mark Shortis for making this event possible. We would like to thank Prof. Changlin Wang, Executive Editor of the International Journal of Digital Earth (IJDE), for his encouragement and advice, and Ms. Zhen Liu of the IJDE Editorial Office for her assistance. All authors and editors would also like to thank anonymous reviewers for their constructive comments on the papers.
Chris Pettit
University of New South Wales
Arzu Coltekin
University of Switzerland
Bo Wu
Hong Kong Polytechnic University
Guest Editors