Setting ArcGIS Coordinate Systems

ArcGIS Feature Classes and Feature Datasets use spatial references, which consist of a coordinate system and associated values such as XY resolution and various tolerance values.

Enterprise Architect enables you to capture spatial reference properties using a Class stereotyped as SpatialReference, which is available from the ArcGIS Toolbox pages. The ArcGIS model pattern includes a package named Spatial References, as a placeholder for creating such elements.

To help you model spatial reference properties, Enterprise Architect provides a user interface for selecting one of the predefined coordinate systems. When you select a Geographic or Projected coordinate system, Enterprise Architect automatically inserts default values for the associated properties, such as Well Known Text (WKT), resolution, precision or tolerances. These values are held as Tagged Values on the SpatialReference element.

You can refer to a Spatial Reference Class from any Feature Dataset or Feature Class in your ArcGIS model. Each Feature Dataset and Feature Class has a Tagged Value named SpatialReference for this purpose.

Below is an example SpatialReference element.

ArcGISSpatRef1

 

As shown by the Tagged Value window below, a Projected Coordinate system has been selected, specifically WGS 1984 Australian Centre for Remote Sensing Lambert.

SpatRefTV     WGS1984

Define a Spatial Reference element

Step

Action

See also

1

Open the diagram under the Spatial References package of your ArcGIS model.

(You can actually use any ArcGIS diagram in your model to define Spatial Reference elements; however, the above diagram is a convenient placeholder created by Enterprise Architect's model pattern for ArcGIS.)

 


2

Drag a Spatial Reference element from the ArcGIS Toolbox onto the diagram.

 


3

Click on the Spatial Reference element.

 

 

4

Select the Extensions | ArcGIS | Set Coordinate System menu option.

 

 

5

Select one of the listed coordinate systems.

 

 

6

Click on the OK button.

 

 

Notes

You can refer to this element from any other Feature Dataset or Feature Class, using the SpatialReference Tagged Value; the Spatial Reference element thus provides a single-point of control, should you need to change the Spatial Reference information later
If you do not reference a Spatial Reference Class from any Feature Dataset or Feature Class in your ArcGIS model, Enterprise Architect by default will generate an XML schema with Unknown type of Spatial Reference for these elements