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Author: search.filters.author.Jitkajornwanich, KulsawasdSubject: search.filters.subject.GIS

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    Item type:Publication,
    A Survey of Spatio-Temporal Database Research
    (2018-01-01)
    Pant, Neelabh
    ;
    Fouladgar, Mohammadhani
    ;
    Elmasri, Ramez
    ;
    Jitkajornwanich, Kulsawasd
    The main purpose of spatio-temporal database systems is combining the spatial and temporal features of data. Almost all spatio-temporal applications—such as mobile communication systems, traffic control systems, and GIS with moving objects—have a common basis, which is the requirement to handle both space and time characteristics of the data. Similar to other data types, spatio-temporal data are required to be accurately modeled, structured, and queried efficiently. In this paper, we survey data models, related operations, data structures and access methods for spatial, temporal, and spatio-temporal data types. These access methods basically are enhanced variations of the well-known R-tree.
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    Item type:Publication,
    Proving completeness of open GIS SQL spatial relationships and operations
    (2017-10-19)
    Jitkajornwanich, Kulsawasd
    ;
    Elmasri, Ramez
    OpenGIS SQL is a standard for incorporating GIS and spatial concepts into SQL. Two types of methods are part of OpenGIS SQL: (1) boolean methods for topological relationships among spatial objects, and (2) methods for specifying spatial operations. We prove that the complete set of 2-dimensional spatial relationships defined by Egenhofer can all be specified using OpenGIS SQL operations and relationships. Our proof shows how each spatial relationship can be specified using OpenGIS SQL and thus provides users with the means of determining how each spatial relationship can be written in SQL. This provides users with enhanced usability and flexibility by providing the specific OpenGIS conditions for every possible 2- dimensional spatial relationship.