GISc

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Author:
jess3c
ID:
21866
Filename:
GISc
Updated:
2010-06-03 00:38:52
Tags:
vocab
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Description:
chpt 9
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  1. Categorical data
    Data that are measured at a nominal or an ordinal scale.
  2. Database management system (DBMS)
    A software package for building and manipulating database for such tasks as data input, search, retrieval, manipulation, and output.
  3. Feature attribute table
    An attribute table that has access to the spatial data of features.
  4. Field
    A column in a table that describes an attribute of a spatial feature.
  5. Flat file
    A database that contains all data in a large table.
  6. Foreign key
    One or more attributes that can uniquely identify a record in a table that is to be linked to a base table.
  7. Hierarchical database
    A database that is organized at different levels and uses the one-to-many association between levels.
  8. Interval data
    Data with known intervals between values, such as temperature readings.
  9. Join
    A relational database operation that brings together two tables by using a key that is common to both tables.
  10. Many-to-many relationship
    One type of data relationship in which many records in a table are related to many records in another table.
  11. Many-to-one relationship
    One type of data relationship in which many records in a table are related to one record in another table.
  12. Network database
    A database that is based on the built-in connections across tables.
  13. Nominal data
    Data that show different kinds or different categories, such as land-use types or soil types.
  14. Normalization
    The process of taking a table with all the attribute data and breaking it down to small tables while maintaining the necessary linkages between them in a relational database.
  15. Numeric data
    Data that are measured at an interval or a ratio scale.
  16. One-to-many relationship
    One type of data relationship in which one record in a table is related to many records in another table.
  17. One-to-one relationship
    One type of data relationship in which one record in a table is related to one and only one record in another table.
  18. Ordinal data
    Data that are ranked, such as large, medium, and small cities.
  19. Primary key
    One or more attributes that can uniquely identify a record in a base table.
  20. Ratio data
    Data with known intervals between values that are based on a meaningful zero value, such as a population densities.
  21. Record
    A row in a table that represents a spatial feature.
  22. Relate
    A relational database operation that temporarily connects two tables by using a key common to both tables.
  23. Relational database
    A database that consists of a collection of tables and uses keys to connect the tables.
  24. Soil Survey Geographic (SSURGO)
    A database maintained by the Natural Resources Conservation Service, which archives soil survey data in 7.5-minute quadrangle units.

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