Q-GIS Glossary,

Posted on Jul 2, 2007 By : Mizake Laziaf
This glossary is a sub-set of one developed by the Urban and Regional Information
Systems Association (URISA)


Query
A logical search specification finding spatial features with linked records that contain matching geographic and/or non-graphic attributes. A typical spatial query is the comparison of XY coordinates of features/records with a user-defined spatial window (square, rectangle, circle, or multipoint polygon). Conversely, a query can refer when you ask for various combinations of non-graphic attribute assignments that meet specific specific conditions (e.g., =, <, >, in a set, etc.; also called "Boolean conditions").


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