Computational Geometry and Visualization -- Consistent Handling of Linear Features in Polyline Simplification -- Cartographical Data Treatment Analysis for Real Time Three-Dimensional Terrain Visualization -- A More Efficient Method for Map Overlay in Terralib -- Spatial Databases -- Exploiting Type and Space in a Main Memory Query Engine -- Approximate Query Processing in Spatial Databases Using Raster Signatures -- A Rule-Based Optimizer for Spatial Join Algorithms -- Spatial Query Broker in a Grid Environment -- TerraHS: Integration of Functional Programming and Spatial Databases for GIS Application Development -- Spatial Ontologies and Interoperability -- An Algorithm and Implementation for GeoOntologies Alignment -- Querying a Geographic Database using an Ontology-Based Methodology -- A Method for Defining Semantic Similarities between GML Schemas -- Interoperability among Heterogeneous Geographic Objects -- Distributed GIS / GIS and the Internet -- Web Service for Cooperation in Biodiversity Modeling -- Evaluation of OGC Web Services for Local Spatial Data Infrastructures and for the Development of Clients for Geographic Information Systems -- Towards Gazetteer Integration through an Instance-based Thesauri Mapping Approach -- WS-GIS: Towards a SOA-Based SDI Federation -- Geostatistics, Spatial Statistics and Spatial Analysis -- Electricity Consumption as a Predictor of Household Income: a Spatial Statistics Approach -- Shiryaev-Roberts Method to Detect Space-Time Emerging Clusters -- Testing association between origin-destination spatial locations -- Applications -- GIS Development for Energy Distribution Network Restoration with an Integrated Interface. This volume contains selected papers presented at the VIII Brazilian S- posium on Geoinformatics, GeoInfo 2006, held in Campos do Jordão, Bra- 1 zil, November 19-22, 2006. The GeoInfo conference series , inaugurated in 1999, reached its eighth edition in 2006. GeoInfo continues to consolidate itself as a the most important reference of quality research on geoinform- ics and related fields in Brazil. GeoInfo 2006 brought together researchers and participants from s- eral Brazilian states, and from abroad. Among the authors of the accepted papers, 20 distinct Brazilian academic institutions and research centers are represented, in a clear demonstration of the expansion of research groups on geoinformatics throughout the country. The acceptance rate of GeoInfo conferences is increasingly competitive, which, in our opinion, is a clear sign of the vitality of our research community. The conference included special keynote presentations by Christopher Jones and Martin Kulldorff, who followed GeoInfo's tradition of attracting some of the most prominent researchers in the world to productively int- act with our community, thus generating all sorts of interesting exchanges and discussions. Keynote speakers in earlier GeoInfo editions include Max Egenhofer, Gary Hunter, Andrew Frank, Roger Bivand, Michael Worboys, Werner Kuhn, Stefano Spaccapietra, and Ralf Güting. For the preparation of this edition, authors were encouraged to improve the conference papers, by incorporating suggestions and insights from the discussion sessions that followed oral presentations at the symposium.