GeoS 2005wasthe 1st InternationalConferenceon GeospatialSemantics. It was held in Mexico City, November 29 and 30, 2005. Within the domain of geographic information science (GIS), semantics has become one of the most prominent researchthemes over the last few years.Such concepts as ontology-driven geographic information systems and the geospatial Semantic Web have fuelled a plethora of researchin such areas as geo-ontologies andsemanticsimilarity.ThesetopicscomplementthetraditionalfocusinGIS- search, which has dealt primarily with geometric entities, their spatial relations, and e?cient data structures. Geospatial semantics are expected to play an - creasingly important role for next-generation spatial databases and geographic information systems, as well as for specialized geospatial Web services. GeoS2005wasorganizedinordertoprovideaforumfortheexchangeofsta- of-the-art research results in the areas of modeling and processing of geospatial semantics. Of particular interest were contributions that addressed theories for geospatialsemanticinformation;formalrepresentationsforgeospatialdata;m- elsandlanguagesforgeo-ontologies;alignmentandintegrationofgeo-ontologies; integration of semantics into spatial query processing; similarity comparisons of spatial datasets; ontology-based spatial information retrieval; ontology-driven GIS; geospatial Semantic Web; and multicultural aspects of spatial knowledge. This volume contains 19 papers, which were selected from among 42 subm- sions received in response to the Call for Papers. Each submission was reviewed by three or four Program Committee members and 15 long and 4 short papers were chosen for presentation. Authors of papers included in this volume come from11di?erentcountries,highlightingthebreadthoftheinternationalresearch community that focuses its attention on geospatial semantics. The program was rounded o? with an invited keynote by Jerry Hobbs, and poster presentations.

Inhalt
Theories for the Semantics of Geospatial Information.- Comparing Representations of Geographic Knowledge Expressed as Conceptual Graphs.- Ontology Ontogeny: Understanding How an Ontology Is Created and Developed.- Representing the Meaning of Spatial Behavior by Spatially Grounded Intentional Systems.- Formal Representations for Geospatial Data.- Processes and Events in Dynamic Geo-Networks.- A Qualitative Trajectory Calculus and the Composition of Its Relations.- Modeling Noteworthy Events in a Geospatial Domain.- Similarity Comparison of Spatial Data Sets.- Measuring Semantic Similarity Between Geospatial Conceptual Regions.- Using Semantic Similarity Metrics to Uncover Category and Land Cover Change.- Measuring Arrangement Similarity Between Thematic Raster Databases Using a QuadTree-Based Approach.- Ontology-Based Spatial Information Retrieval.- Extending Semantic Similarity Measurement with Thematic Roles.- Exploiting Geospatial Markers to Explore and Resocialize Localized Documents.- Ontology Matching for Spatial Data Retrieval from Internet Portals.- Geospatial Semantic Web.- Geospatial Semantic Web: Architecture of Ontologies.- Formal Approach to Reconciliation of Individual Ontologies for Personalisation of Geospatial Semantic Web.- Incorporating Update Semantics Within Geographical Ontologies.- Short Papers.- Purpose-Driven Navigation.- Mobile GIS: Attribute Data Presentation Under Time and Space Constraints.- Ontology-Driven Description of Spatial Data for Their Semantic Processing.- An Interstage Change Model for Sandbox Geography.