Since the first symposium in 1984 the International Symposia on Spatial Data Handling (SDH) has become a major resource for recent advances in GIS research. The International Symposium on Spatial Data Handling is regarded as a premier international research forum for GIS. All papers are fully reviewed by an international program committee composed of experts in the field.

Table of Contents:
Plenary of Submitted Papers.- The Devil is still in the Data: Persistent Spatial Data Handling Challenges in Grassroots GIS.- Physical vs. Web Space — Similarities and Differences.- Spatial Cognition.- Utilization of Qualitative Spatial Reasoning in Geographic Information Systems.- Identification of the Initial Entity in Granular Route Directions.- Data Models.- Modeling and Engineering Algorithms for Mobile Data.- Database Model and Algebra for Complex and Heterogeneous Spatial Entities.- QACHE: Query Caching in Location-Based Services.- A Voronoi-Based Map Algebra.- Modeling Geometric Rules in Object Based Models: An XML / GML Approach.- Data Mining.- Exploring Geographical Data with Spatio-Visual Data Mining.- Continuous Wavelet Transformations for Hyperspectral Feature Detection.- Measuring Linear Complexity with Wavelets.- Expert Knowledge and Embedded Knowledge: Or Why Long Rambling Class Descriptions are Useful.- Data Retrieval.- Preference Based Retrieval of Information Elements.- Spatiotemporal Event Detection and Analysis over Multiple Granularities.- Reduced Data Model for Storing and Retrieving Geographic Data.- Filling the Gaps in Keyword-Based Query Expansion for Geodata Retrieval.- Data Quality.- Using Metadata to Link Uncertainty and Data Quality Assessments.- An Evaluation Method for Determining Map-Quality.- Efficient Evaluation Techniques for Topological Predicates on Complex Regions.- Implementation of a Prototype Toolbox for Communicating Spatial Data Quality and Uncertainty Using a Wildfire Risk Example.- Integration and Fusion.- Changes in Topological Relations when Splitting and Merging Regions.- Integrating 2D Topographic Vector Data with a Digital Terrain Model — a Consistent and Semantically Correct Approach.- A Hierarchical Approach tothe Line-Line Topological Relations.- Coastline Matching Process Based on the Discrete Fréchet Distance.- Semantics and Ontologies.- Characterizing Land Cover Structure with Semantic Variograms.- Semantic Similarity Measures within the Semantic Framework of the Universal Ontology of Geographical Space.- A Quantitative Similarity Measure for Maps.- A Semantic-based Approach to the Representation of Network-Constrained Trajectory Data.- Towards an Ontologically-driven GIS to Characterize Spatial Data Uncertainty.- 2D-Visualization.- Structuring Kinetic Maps.- Advanced Operations for Maps in Spatial Databases.- A Tangible Augmented Reality Interface to Tiled Street Maps and its Usability Testing.- A Linear Programming Approach to Rectangular Cartograms.- 3D-Visualization.- Automated Construction of Urban Terrain Models.- A Flexible, Extensible Object Oriented Real-time Near Photorealistic Visualization System: The System Framework Design.- A Tetrahedronized Irregular Network Based DBMS Approach for 3D Topographic Data Modeling.- 3D Analysis with High-Level Primitives: A Crystallographic Approach.- Generalization.- The Hierarchical Watershed Partitioning and Data Simplification of River Network.- Grid Typification.- Skeleton Based Contour Line Generalization.- Conflict Identification and Representation for Roads Based on a Skeleton.- The’ stroke’ Concept in Geographic Network Generalization and Analysis.- Uncertainty.- An Integrated Cloud Model for Measurement Errors and Fuzziness.- The Influence of Uncertainty Visualization on Decision Making: An Empirical Evaluation.- Modeling Uncertainty in Knowledge Discovery for Classifying Geographic Entities with Fuzzy Boundaries.- Capturing and Representing Conceptualization Uncertainty Interactively using Object-Fields.-Elevation Modeling.- From Point Cloud to Grid DEM: A Scalable Approach.- Use of Plan Curvature Variations for the Identification of Ridges and Channels on DEM.- An Evaluation of Spatial Interpolation Accuracy of Elevation Data.- Working with Elevation.- I/O-Efficient Hierarchical Watershed Decomposition of Grid Terrain Models.- Tradeoffs when Multiple Observer Siting on Large Terrain Cells.- Scale-Dependent Definitions of Gradient and Aspect and their Computation.- Spatial Modeling.- Development Density-Based Optimization Modeling of Sustainable Land Use Patterns.- Building an Integrated Cadastral Fabric for Higher Resolution Socioeconomic Spatial Data Analysis.- Analysis of Cross Country Trafficability.