Glossary


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Quadtree Model
A type of hierarchical model to access map data by partitioning the map area into four sub-areas step by step, that is 4, 16, 32 .........in order to access a particular area at high speed.

Queen's move
Eight directions from the center of a window of 3 x 3 matrix with a sequence code number by which a line or a flow can be represented.

The Queen's move has come from the chess game.

Query
The selective retrieval of attribute data without altering existing data stored in the database.


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