Keynotes -- Maps Get Real: Digital Maps evolving from mathematical line graphs to virtual reality models -- On Valid and Invalid Three-Dimensional Geometries -- Papers -- Navigable Space in 3D City Models for Pedestrians -- Towards 3D Spatial Data Infrastructures (3D-SDI) based on open standards - experiences, results and future issues -- Re-using laser scanner data in applications for 3D topography -- Using Raster DTM for Dike Modelling -- Development of a Web Geological Feature Server (WGFS) for sharing and querying of 3D objects -- Using 3D-Laser-Scanners and Image-Recognition for Volume-Based Single-Tree-Delineation and -Parameterization for 3D-GIS-Applications -- Automatic building modeling from terrestrial laser scanning -- 3D City Modelling from LIDAR Data -- First implementation results and open issues on the Poincaré-TEN data structure -- Drainage reality in terrains with higher-order Delaunay triangulations -- Surface Reconstruction from Contour Lines or LIDAR elevations by Least Squared-error Approximation using Tensor-Product Cubic B-splines -- Modelling and Managing Topology in 3D Geoinformation Systems -- Mathematically provable correct implementation of integrated 2D and 3D representations -- 3D Solids and Their Management In DBMS -- Implementation alternatives for an integrated 3D Information Model -- Serving CityGML via Web Feature Services in the OGC Web Services - Phase 4 Testbed -- Towards 3D environmental impact studies: example of noise -- The Kinetic 3D Voronoi Diagram: A Tool for Simulating Environmental Processes -- Techniques for Generalizing Building Geometry of Complex Virtual 3D City Models -- Automatic Generation of Residential Areas using Geo-Demographics -- Position papers -- Working Group I - Requirements and Applications - Position Paper: Requirements for 3D in Geographic Information Systems Applications -- Working Group II - Acquisition - Position Paper: Data collection and 3D reconstruction -- Working Group III - Modelling - Position Paper: Modelling 3D Geo-Information -- Working Group IV - Analysis - Position Paper: Spatial Data Analysis in 3D GIS -- Working Group V - Visualization - Position Paper: 3D Geo-Visualization. Society is expecting and demanding more 3D support since users have - perienced the added value in emerging visualisation applications such as 3D globe based interfaces, navigation systems presenting a 3D perspective, etc. Due to the rapid developments in sensor techniques more 3D data have - come available. E?ective algorithms for (semi) automatic object reconstr- tion are required. Integration of existing 2D objects with height data is a non-trivial process, and further research is needed. The resulting 3D models can be maintained in several forms: TEN (Tetrahedral Network), constr- tive solid geometry (CSG) models, regular polytopes, TIN boundary r- resentation and 3D volume quad edge structure, layered/topology models, voxel based models, 3D models used in urban planning/polyhedrons, and n-dimensional models including time. 3D analysis and 3D simulation te- niques explore and extend the possibilities of spatial applications. In such a dynamic scienti?c environment, it is very important to have high quality and an open exchange of ideas on these new developments. It is also very important to carefully review and document the progress that is made. This book and the associated 3D GeoInfo workshop are an attempt to achieve this goal. The workshop is the second in a series on 3D geo-information. The previous event took place in Kuala Lumpur, Malaysia, on 7-8 August 2006 (http://www. fksg. utm. my/3dgeoinfo2006). Selected papers from the ?rst workshop were published in 'Innovations in 3D Geo Information Systems', Springer-Verlag, 2006.