1. © 2011 Bentley Systems, Incorporated 1 | WWW.BENTLEY.COM Create Custom Geographic Coordinate System Problem : Project requires a new or updated GCS that is not part of delivered library Solution : Use Bentley Map to create new GCS (or ellipsoid or datum) and share with all users Notes: –The delivered library cannot be changed or updated –A user library should be created to store any custom coordinate system definitions –Library can be used with any MicroStation installation

2. © 2011 Bentley Systems, Incorporated 2 | WWW.BENTLEY.COM Create User GCS Library Copy seed GCS library from Bentley Map coordinate system folders to accessible location –From: C:\Program Files\Bentley\MapEnterprise V8i\MapEnterprise\coordinate\seed\ seed.dty –To: your project location. e.g.: C:\Projects\EastCity\rsc\EastCity.dty Define variable to point to new GCS library Save in workspace or Map project MS_GEOCOORDINATE_USERLIBRARIES = C:\Projects\EastCity\rsc\EastCity.dty

3. © 2011 Bentley Systems, Incorporated 3 | WWW.BENTLEY.COM Using the Custom GCS Library Start Bentley Map using workspace with GCS library variable defined. In GCS dialog, see the entry for the custom library To create custom GCS, copy an existing GCS similar to new GCS and paste into user library

4. © 2011 Bentley Systems, Incorporated 4 | WWW.BENTLEY.COM To Edit GCS properties Select GCS and Edit Coordinate System Properties Make any changes required including the name Save

5. © 2011 Bentley Systems, Incorporated 5 | WWW.BENTLEY.COM To Add a Datum or Ellipsoid Select the correct editing tool Select New Enter Properties and Save

6. © 2011 Bentley Systems, Incorporated 6 | WWW.BENTLEY.COM Custom GCS, datum and ellipsoids can only be created with Bentley Map The resulting custom GCS library can be shared with any MicroStation user by defining the variable to point to the location of the custom library All names must be unique across the delivered and custom libraries A DGN with a custom GCS will behave correctly even if the library from which the GCS was defined is not available Summary