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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

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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

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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

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To Edit GCS properties

• Select GCS and Edit Coordinate System Properties

• Make any changes required including the name

• Save

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To Add a Datum or Ellipsoid

• Select the correct editing tool

• Select New

• Enter Properties and Save

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• 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