ISPRS-AnnalsISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information SciencesISPRS-AnnalsISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.2194-9050Copernicus PublicationsGöttingen, Germany10.5194/isprs-annals-III-6-1-2016PREFACEGongJianya1WoldaiTsehaie23Wuhan University, The State Key Lab of Information Engineering in Surveying, Mapping & Remote Sensing 129 Luoyu Road, 430079 Wuhan, ChinaUniversity of Witwatersrand, School of Geosciences, 2050, 1 Jan Smuts Avenue, Johannesburg, South AfricaVeelmanlanden 30, 7542 MB Enschede, the Netherlands06062016III-611This article is available from https://isprs-annals.copernicus.org/articles/isprs-annals-III-6-1-2016.htmlThe full text article is available as a PDF file from https://isprs-annals.copernicus.org/articles/isprs-annals-III-6-1-2016.pdf