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19 Cards in this Set
- Front
- Back
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Data
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consist of symbols that represent measurements of phenomena
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Information
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data that has been selected or created in response to a question.
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Information systems
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computer-based tools that help people transform data into information.
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GIS
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a computer-based tool used to help people transform geographic data into geographic information.
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tables
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data files
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database
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a collection of tables
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Database management systems
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are information systems that people use to store/ update/ and analyze non-geographic databases.
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query
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A question that is addressed to a database through a DBMS
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union
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two or more data files is a single file that includes all records and attributes without redundancy
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intersection
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produces a data file that contains only records present in all files.
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difference
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operation produces a data file that eliminates records that appear in both original files.
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relational databases
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Databases that contain numerous files that share one or more keys
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relational database management systems
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database systems that enable users to produce information from relational databases
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vector
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involves sampling locations at intervals along the length of linear entities (like roads) or around the perimeter of areal entities (like property parcels).
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raster
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involves sampling attributes at fixed intervals. Each sample represents one cell in a checkerboard-shaped grid.
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geoid
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Earth's "actual" irregular shape
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map projections
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The set of mathematical transformations by which spherical locations are converted to locations on a plane
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spatial autocorrelation
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A statistical measure of the similarity of attributes of point locations
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interpolation
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The process of estimating unknown values from nearby known values
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