Last modified: Oct 31, 2006
GIS Dictionary
This dictionary includes terms from GIS operations such as analysis, data management, and geocomputation; from rapidly evolving uses of GIS for modeling, GIScience, and Web-based GIS; and from the GIS foundation fields of cartography, spatial statistics, computer science, surveying, geodesy, and remote sensing. This online GIS Dictionary also includes ESRI software-specific terminology.
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data model
See Also :
data structure
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[data models] In GIS, a mathematical construct for representing geographic objects or surfaces as data. For example, the vector data model represents geography as collections of points, lines, and polygons; the raster data model represents geography as cell matrixes that store numeric values; and the TIN data model represents geography as sets of contiguous, nonoverlapping triangles.
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[ESRI software] In ArcGIS, a set of database design specifications for objects in a GIS application. A data model describes the thematic layers used in the application (for example, hamburger stands, roads, and counties); their spatial representation (for example, point, line, or polygon); their attributes; their integrity rules and relationships (for example, counties must nest within states); their cartographic portrayal; and their metadata requirements.
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[data models] In information theory, a description of the rules by which data is defined, organized, queried, and updated within an information system (usually a database management system).
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