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SAP Sybase SQL Anywhere 16.0 » Context-Sensitive Help » SQL Anywhere plug-in help » SQL Anywhere properties windows

 

Spatial Reference System Properties window: Coordinates tab

This tab has the following components:

  • Latitude   Specifies the bounds on the latitude dimensions. This option appears when the Spatial Reference System Type is Geographic.

    • Bounded between North/South   Specifies the north and south bounds.

    • Unbounded   Specifies to place no bounds on North/South.

  • Longitude   Specifies the bounds on the longitude dimensions. This option appears when the Spatial Reference System Type is Geographic.

    • Bounded between West/East   Specifies the east and west bounds.

    • Unbounded   Specifies to place no bounds on West/East.

  • X   Specifies the bounds on the x-axis. This option appears when the Spatial Reference System Type is Non-geographic.

    • Bounded between minimum/maximum   Specifies the minimum and maximum bounds for the x-axis.

    • Unbounded   Specifies to place no bounds on x values.

  • Y   Specifies the bounds on the y-axis. This option appears when the Spatial Reference System Type is Non-geographic.

    • Bounded between minimum/maximum   Specifies the minimum and maximum bounds for the y-axis.

    • Unbounded   Specifies to place no bounds on y values.

  • Z   Specifies the bounds for the z values.

    • Bounded between minimum/maximum   Specifies the minimum and maximum bounds for z values.

    • Unbounded   Specifies to place no bounds on z values.

  • M   Specifies the bounds for the m values.

    • Bounded between minimum/maximum   Specifies the minimum and maximum bounds for m values.

    • Unbounded   Specifies to place no bounds on m values.

  • Snap to grid   Specifies the size of grid SQL Anywhere uses when performing calculations. This option is disabled when the Line Interpretation is Round Earth.

    By default, SQL Anywhere automatically sets the grid size so that 12 significant digits can be stored for every point within the X and Y bounds. For example, if X is set to -180 and 180, and Y is set to -90 and 90, the database server sets the grid size to 0.000000001 (1E-9).

    However, you can specify a custom Snap To Grid. If you specify a custom Snap To Grid value, the database server always uses the custom value instead, regardless of changes to the X and Y bounds.

    See SNAP TO GRID clause, CREATE SPATIAL REFERENCE SYSTEM statement.

  • Tolerance   Specifies the precision that SQL Anywhere uses when comparing points. This option is disabled when the Line Interpretation is Round Earth.

    If the distance between two points is less than what is specified, the two points are considered equal. Specifying a distance allows you to control the tolerance for imprecision in the input data or limited internal precision. By default, Tolerance is set to be equal to Snap To Grid.

    See TOLERANCE clause, CREATE SPATIAL REFERENCE SYSTEM statement.

  • Linear unit of measure   Specifies the linear unit of measure. The default is Metre.

    For non-geographic spatial reference systems, when you change the Linear Unit of Measure the coordinate bounds are translated to the new unit of measure. See LINEAR UNIT OF MEASURE clause, CREATE SPATIAL REFERENCE SYSTEM statement.

  • Angular unit of measure   Specifies the angular unit of measure. This option applies only to geographic spatial reference systems.

    The default is Degree for geographic spatial reference systems and Null for non-geographic spatial reference systems.

    For geographic spatial reference systems, when you change the Angular Unit of Measure the coordinate bounds on the Settings tab are translated to the new unit of measure.

    See ANGULAR UNIT OF MEASURE clause, CREATE SPATIAL REFERENCE SYSTEM statement.