FernUniversitat

Displaying 1-8 of 8 results

  • White Papers // Jan 2011

    Partition and Conquer

    Although maps and partitions are ubiquitous in geographical information systems and spatial databases, there is only little work investigating their foundations. The authors give a rigorous definition for spatial partitions and propose partitions as a generic spatial data type that can be used to model arbitrary maps and to support...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Vague Regions

    In many geographical applications there is a need to model spatial phenomena not simply by sharp objects but rather through indeterminate or vague concepts. To support such applications the authors present a model of vague regions which covers and extends previous approaches. The formal framework is based on a general...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Developments in Spatio-Temporal Query Languages

    Integrating spatio-temporal data as abstract data types into already existing data models is a promising approach to creating spatio-temporal query languages. In this paper, an important new class of queries can be identified which is concerned with developments of spatial objects over time, that is, queries ask especially for changes...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Temporal Objects for Spatio-Temporal Data Models and a Comparison of Their Representations

    The authors have presented a new model for temporal objects and temporal databases that, in particular, offers quite different modeling options for spatio-temporal databases. The investigation of the relative expressiveness of the different models gives a clear picture of the relationships between these models. In particular, it can be seen...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Realms: A Foundation for Spatial Data Types in Database Systems

    In this paper the authors have offered geometric realms as a concept to solve several problems related to spatial data types for database systems. In particular, realms solve the geometric consistency problem as well as problems of numeric robustness and topological correctness. Realm-based structures can be used for the definition...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Metric Operations on Fuzzy Spatial Objects in Databases

    Uncertainty management for geometric data is currently an important problem for (extensible) databases in general and for spatial databases, image databases, and GIS in particular. In these systems, spatial data are traditionally kept as determinate and sharply bounded objects; the aspect of spatial vagueness is not and cannot be treated...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Finite Resolution Crisp and Fuzzy Spatial Objects

    Uncertainty management for geometric data is currently an important problem in spatial databases, image databases, and GIS. Spatial objects do not always have homogeneous interiors and sharply defined boundaries but frequently their interiors and boundaries are partially or totally indeterminate and vague. For an important kind of spatial vagueness called...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Abstract and Discrete Modeling of Spatio-Temporal Data Types

    Spatio-temporal databases deal with geometries changing over time. In general, geometries cannot only change in discrete steps, but continuously, and the authors are talking about moving objects. If only the position in space of an object is relevant, then moving point is a basic abstraction; if also the extent is...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Partition and Conquer

    Although maps and partitions are ubiquitous in geographical information systems and spatial databases, there is only little work investigating their foundations. The authors give a rigorous definition for spatial partitions and propose partitions as a generic spatial data type that can be used to model arbitrary maps and to support...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Vague Regions

    In many geographical applications there is a need to model spatial phenomena not simply by sharp objects but rather through indeterminate or vague concepts. To support such applications the authors present a model of vague regions which covers and extends previous approaches. The formal framework is based on a general...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Developments in Spatio-Temporal Query Languages

    Integrating spatio-temporal data as abstract data types into already existing data models is a promising approach to creating spatio-temporal query languages. In this paper, an important new class of queries can be identified which is concerned with developments of spatial objects over time, that is, queries ask especially for changes...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Temporal Objects for Spatio-Temporal Data Models and a Comparison of Their Representations

    The authors have presented a new model for temporal objects and temporal databases that, in particular, offers quite different modeling options for spatio-temporal databases. The investigation of the relative expressiveness of the different models gives a clear picture of the relationships between these models. In particular, it can be seen...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Realms: A Foundation for Spatial Data Types in Database Systems

    In this paper the authors have offered geometric realms as a concept to solve several problems related to spatial data types for database systems. In particular, realms solve the geometric consistency problem as well as problems of numeric robustness and topological correctness. Realm-based structures can be used for the definition...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Metric Operations on Fuzzy Spatial Objects in Databases

    Uncertainty management for geometric data is currently an important problem for (extensible) databases in general and for spatial databases, image databases, and GIS in particular. In these systems, spatial data are traditionally kept as determinate and sharply bounded objects; the aspect of spatial vagueness is not and cannot be treated...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Finite Resolution Crisp and Fuzzy Spatial Objects

    Uncertainty management for geometric data is currently an important problem in spatial databases, image databases, and GIS. Spatial objects do not always have homogeneous interiors and sharply defined boundaries but frequently their interiors and boundaries are partially or totally indeterminate and vague. For an important kind of spatial vagueness called...

    Provided By FernUniversitat

  • White Papers // Jan 2011

    Abstract and Discrete Modeling of Spatio-Temporal Data Types

    Spatio-temporal databases deal with geometries changing over time. In general, geometries cannot only change in discrete steps, but continuously, and the authors are talking about moving objects. If only the position in space of an object is relevant, then moving point is a basic abstraction; if also the extent is...

    Provided By FernUniversitat