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-IV-2-W1-1-2016PREFACEDimopoulouE.1van OosteromP.2School of Rural and Surveying Engineering, National Technical University of Athens, 9 Iroon Polytechneiou str, 15780 Zografou, GreeceDelft University of Technology, Faculty of Architecture and the Built Environment, Department OTB, GIS Technology Section, P.O. Box 5030, 2600 GA Delft, The Netherlands05102016IV-2/W111This article is available from https://isprs-annals.copernicus.org/articles/isprs-annals-IV-2-W1-1-2016.htmlThe full text article is available as a PDF file from https://isprs-annals.copernicus.org/articles/isprs-annals-IV-2-W1-1-2016.pdf