Spatial Reference Systems (IQ/SQL Anywhere)

IQ v15.4 and higher and SQL Anywhere v12 and higher support spatial reference systems, which define the space in which geometries are described. PowerDesigner models spatial reference systems as extended objects with a stereotype of <<SpatialReferenceSystem>>.

Creating a Spatial Reference System

You can create a spatial reference system in any of the following ways:

Select Model Spatial Reference Systems to access the List of Spatial Reference Systems, and click the Add a Row tool.
Right-click the model (or a package) in the Browser, and select New Spatial Reference System .

Spatial Reference System Properties

You can modify an object's properties from its property sheet. To open a spatial reference system property sheet, double-click its diagram symbol or its Browser entry in the Spatial Reference Systems folder.

The following extended attributes are available on the General tab:

Name	Description
Spatial reference system identifier	Specifies the SRID (srs-id) for the spatial reference system. Scripting name: `SRS_Id`
Organization	Specifies the organization that created the spatial reference system that the new spatial reference system is based on. Scripting name: `Organization`
Organization coordinate reference system ID	Specifies the numeric identifier the organization uses to identify the spatial reference system. Scripting name: `OrganizationSRSId`

Name

Description

Spatial reference system identifier

Specifies the SRID (srs-id) for the spatial reference system.

Scripting name: SRS_Id

Organization

Specifies the organization that created the spatial reference system that the new spatial reference system is based on.

Scripting name: Organization

Organization coordinate reference system ID

Specifies the numeric identifier the organization uses to identify the spatial reference system.

Scripting name: OrganizationSRSId

The following extended attributes are available on the Settings tab:

Name	Description
Line interpretation	Specifies how the SRS interprets lines between points. Scripting name: `LineInterpretation`
Axis order	Specifies the order in which values are given for each axis. Scripting name: `AxisOrder`
Polygon format	Specifies how polygons are interpreted. Scripting name: `PolygonFormat`
Storage format	Specifies how data is stored. Scripting name: `StorageFormat`
Definition	Specifies default coordinate system settings. If any attribute is set in a clause other than the `DEFINITION` clause, the value specified in the other clause is used regardless of what is specified in the `DEFINITION` clause. Scripting name: `Definition`
Type	Specifies whether the system is Projected, Geographic, or Engineering. If a definition is given, this attribute is computed from the definition text. Scripting name: `SRSType`
Transform definition	Specify a description of the transform to use for the spatial reference system. Scripting name: `TransformDefinition`

The following extended attributes are available on the Coordinate tab:

Name	Description
`<Axis>`/Bounded/Unbounded	Specifies whether the axis is bounded or unbounded and, if it is bounded, the minimum and maximum values. Scripting name: `BoundedCoordinate<Axis>`, `MinCoordinate<Axis>`, `MaxCoordinate<Axis>`
Ellipsoid axis length	[round earth systems] Specifies the values to use for representing the Earth as an ellipsoid. Scripting name: `SemiMajorAxisLength`, `SemiMinorAxisLength`, `InverseFlattening`
Grid Size	[planar systems] Specifies the size of the grid to use when performing calculations. Scripting name: `GridSize`
Tolerance	[planar systems] Specifies the precision to use when comparing points. Scripting name: `Tolerance`
Linear/Angular unit of measure	Specify the linear and angular units of measure for the spatial reference system. Scripting name: `LinearUnitOfMeasure, AngularUnitOfMeasure`