Integrating Spatio-Thematic Information
نویسندگان
چکیده
Mechanisms for overcoming semantic heterogeneity in diverse information sources are critical components of any interoperable system. In the case of diverse geographic information sources, such mechanisms present particular difficulties since the semantic structure of geographic information cannot be considered independently of its spatial structure. This paper develops an approach to the integration of semantically heterogeneous geographic information that is capable of addressing the spatial and thematic aspects of geographic information in concert. The approach is founded on an algebraic model of spatio-thematic information layers. Variations in the thematic structure of layers are explored, including the integration of layers with hierarchical thematic structure. The effects of changes in the thematic granularity of layers are also considered. Finally, a case study of the integration of heterogeneous land cover data is used to illustrate the relevance of the formal model within a practical application.
منابع مشابه
Generic query tool for spatio-temporal data
Geographical information systems are more and more based on a DBMS with spatial extensions, which is also the case for the system described in this paper. The design and implementation of a generic geographical query tool, a platform for querying multiple spatio-temporal data sets and associated thematic data, is presented. The system is designed to be generic, that is without one speci c appl...
متن کاملMining Frequent Patterns from Spatio- Temporal Data Sets: a Survey
Space and time are implicit in every activity of life. Every real-world object has its past, present, future and hence is intrinsically tied up with location and time. Storing spatio-temporal attributes in the databases along with the thematic attributes enriches the data and the inherent knowledge stored in the database. Spatio-temporal databases provide description of real-world phenomenon in...
متن کاملPerformance of a spatio-temporal error model for raster datasets under complex error patterns
The CLC (Combined Location Classification) error model provides indices for overall data uncertainty in thematic spatio-temporal datasets. It accounts for the two major sources of error in such datasets, location error and classification error. The model assumes independence between error components, while recent studies revealed various degrees of correlation between error components in actual...
متن کاملA Qualitative Approach to Vague Spatio-Thematic Query Processing
In order to support the processing of spatial queries, spatial knowledge must be represented in a way that machines can make use of it. In ontology-based geographic information systems, a challenge thus is to enhance thematic knowledge with spatial knowledge. A way to achieve this is to combine existing approaches to spatial knowledge representation with ontologies. In this paper an implementat...
متن کاملReconstruction of Spatio-temporal Human Distribution by Integrating Multi-source Data
Recently many kinds of spatio-temporal data are being repeatedly acquired or generated mainly because of the rapid progress of data acquisition technology in recent times. However, those data are still so limited and "fragmentary" in terms of observation frequency, spatial coverage and thematic accuracy, etc., that we cannot always directly monitor dynamic changes of the spatial objects or feat...
متن کامل