GIS Chpt 1

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GIS Chpt 1
2010-04-03 00:05:00
Chpt 1 Vocab

Chapter 1 Key Terms
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  1. Attribute data
    Data that describe the characteristics of spatial features.
  2. Continuous features
    Spatial features that exist between observations.
  3. Coverage
    An ESRI data format for topological vector data.
  4. Data exploration
    Data-centered query and analysis.
  5. Discrete features
    Spatial features that do not exist between observations, form separate entities, and are individually distinguishable.
  6. Dynamic segmentation model
    A data model that allows the use of linearly measured data on a coordinate system.
  7. Geodatabase data model
    An ESRI data model that is object-based.
  8. Geographic information system (GIS)
    A computer system for capturing, storing, querying, analyzing, and displaying geographically referenced data.
  9. Georelational data model
    A vector data model that uses a split system to store spatial data and attribute data.
  10. Geospatial data
    Data that describe both the locations and characteristics of spatial features on the Earth's surface.
  11. GIS modeling
    The process of using GIS in building models with spatial data.
  12. Object-based data model
    A data model that uses objects to organize spatial data and stores spatial data and attribute data in a single system.
  13. Projection
    The process of transforming from a geographic grid to a plane coordinate system.
  14. Raster data model
    A spatial data model that uses a grid and cells to represent the spatial variation of a feature.
  15. Regions
    Higher-level vector data that can have spatially disjoint components and can overlap one another.
  16. Relational database
    A collection of tables, which can be connected to each other by attributes whose values can uniquely identify a record in a table.
  17. Shapefile
    An ESRI data format for nontopological vector data.
  18. Spatial data
    Data that describe the geometry of spatial features.
  19. Spatial interpolation
    A process of using points with known values to estimate values at other points.
  20. Topology
    A subfield of mathematics that is applied in GIS to ensure that the spatial relationships between features are expressed explicitly.
  21. Triangulated irregular network (TIN)
    A data model that approximates the terrain with a set of nonoverlapping triangles.
  22. Vector data model
    A spatial data model that uses points and their x-, y-coordinates to construct spatial features of points, lines, and areas.