Bio
Peter van Oosterom obtained a MSc in Technical Computer Science in 1985 from Delft University of Technology. In 1990 he received a PhD from Leiden University for this thesis "Reactive Data Structures for GIS" (updated version published by Oxford University Press, 1993). From 1985 until 1995 he worked at the TNO-FEL laboratory in The Hague, The Netherlands as a computer scientist. From 1995 until 2000 he was senior information manager at the Netherlands’ Kadaster, were he was involved in the renewal of the Cadastral (Geographic) database. Since 2000, professor Peter van Oosterom is head of the section ‘GIS Technology’ at the Delft University of Technology. His main research themes are spatial database management systems, GIS architectures, generalization, spatial analysis, querying and presentation, Internet/interoperable GIS and cadastral applications.

Abstract
Principles of 5D modeling
This paper proposes an approach for data modelling in five dimensions. Apart from three dimensions for geometrical representation and a fourth dimension for time, we identify scale as fifth dimensional characteristic. Considering scale as an extra dimension of geographic information, fully integrated with the other dimensions, is new. Through a formal definition of geographic data in a conceptual 5D continuum, the data can be handled by one integrated approach assuring consistency across scale and time dimensions. Because the approach is new and challenging, we choose to step-wise studying several combinations of the five dimensions, ultimately resulting in the optimal 5D model. We also propose to apply mathematical theories on multidimensional modelling to well established principles of multidimensional modelling in the geo-information domain. The result is a conceptual full partition of the 3Dspace+time+scale space (i.e. no overlaps, no gaps) to be realised in a 5D data model implemented in a Database Management System.

Bio
Jantien Stoter received the Tienstra research-award for her PhD on 3D Cadastre(2004). She currently fulfils a dual position: one as Associate Professor at TU Delft and one as researcher at the Kadaster. From both employers she is posted to Geonovum. She leads the national 3D pilot, which was awarded with the OGC 3D award in September 2011. In 2010 she received the prestigious VIDI award given by the Netherlands Organisation for Scientific Research.

Abstract
5D Data modeling: from theory to practice
This presentation will explain how 5D data models and data structures may solve the issues of redundancy and inconsistency caused by unconnected data sets about the same location at several scales and time periods. This presentation will translate the 5D data approach to practical cases and will also show how the intermediate 3D models (2D+scale; 2D+time) and 4D models (2D+scale+time;3D+time) already yield fundamental improvements compared to current independent management of 2D/3D multiscale and spatiotemporal data.

Our subsurface is modeled in 3D to represent the various geological components. No other discipline has such as long tradition in 3D modelling. Various types of models have been applied; both voxel-based and volumetric vector-based representations. In addition geology has also always include the temporal dimension as part of the interpretation. In this presentation the possible advantages and disadvantages of integrated 3D space and time representations will be analysed.