Using Google Earth

Before using Google Earth, assign a geographic coordinate system to the DGN Model.

Open the Google Earth application separate from MicroStation.  On the Google Earth Sidebar, under Layers, uncheck the terrain button to enhance operations.
Google Earth Layers sidebar

Open or create a 3D DGN Model with a Geographic Coordinate System assigned. A working 3D dgn with nested references of a horizontal alignment is typical.  Much of the Google Earth tools can be used in 2D.

To begin, go to Tools> Geographic> Open as ToolBox. The Geographic menu will appear.
Geographic menu

Synchronize Google Earth View

This tool can be use to quickly verify if the Geographic Coordinate System (GeoCS) has been correctly assigned.

In MicroStation, window to an area of interest in order view the same area in Google Earth.

Select Synchronize Google Earth View icon.
Geographic menu with Synchronize Google Earth View icon
The Google Earth image will be synchronized to the location and scale of the dgn.  If the image is not synchronized, the GeoCS may be incorrect.

Follow Google Earth View

In Google Earth, window into an area of interest in order to view the same area in MicroStation.

Select Follow Google Earth View icon.
Geographic menu with Follow Google Earth View icon
The MicroStation view will be synchronized to the location and scale of the Google Earth image.

Export Google Earth (KML) File)

This feature will export the dgn drawing elements to a google (kmz) file.  This file format can be shared easily without the need for MicroStation and can opened with the free version of Google Earth.  Many other programs can use the kmz format as well.

First Select Google Earth Settings.
Geographic menu with Google Earth Settings icon

Adjust to typical settings below. Note, converting undisplayed levels may allow the export of sensitive data. Then Select OK.
Google Earth Settings menu

Select Export Google Earth (KML) File.
Geographic menu with Export Google Earth (KML) File incon

Next, Select No Wizard, then Select OK.
Select a Wizard menu

Name file accordingly and use a description.  Next Select Save.  Note, the file will be created with kmz format. 
Create Google Earth (KML) File menu

Allow to process.  Next, In Google Earth, open newly created kmz file. Google capture shown.
Google Earth image capture with kmz data

Note the levels available in Google Earth.
Google Earth Places sidebar

Capture Google Earth Image

The DGN Model must be in 3D to use this tool. To create a 3D DGN Model in an existing drawing, Select Model on the Primary Tool Bar
Primary Tools menu

The Models menu appears.  Select Create a new model icon.
Models menu

Create 3D Model as shown below
Create Model menu

After creating a new model, the new model becomes active. Shown is the Models menu with the newly created model. Note the 3D icon.
Models menu with new 3D model

Select Capture Google Earth Image icon. Next, data point in the center of the MicroStation view.
Geographic menu with Capture Google Earth Image icon

A 3D wireframe mesh will appear in the drawing covering the view area.
Dgn with 3D wire mesh

Next, change View Attributes, display style to "Smooth" to view the Google Image
View Attributes menu

The Google Image will appear.
Dgn with Google image

Note the Google image is in black and white and is a lower resolution.  The actual Google image is located in the PW C:/drive dms folder and must be manually moved to PW working directory for future use. The file will be named filenameTerrainCapture1.jpg.  The numeral changes with each additional capture.

The 3D Model should be referenced into the 2D model, also presentation set to smooth in the reference manager, and change the reference update sequence to display the 3D model first in the update sequence settings.

This method is not efficient.  Large areas are not recommended.  Consult with Survey and Mapping for larger Google Earth images.  There are other methods to obtaining larger areas of aerial photography. 

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