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.
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.
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.
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.
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.
Adjust to typical settings below. Note, converting undisplayed levels may allow the export of sensitive data. Then Select OK.
Select Export Google Earth (KML) File.
Next, Select No Wizard, then Select OK.
Name file accordingly and use a description. Next Select Save. Note, the file will be created with kmz format.
Allow to process. Next, In Google Earth, open newly created kmz file. Google capture shown.
Note the levels available in Google Earth.
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
The Models menu appears. Select Create a new model icon.
Create 3D Model as shown below
After creating a new model, the new model becomes active. Shown is the Models menu with the newly created model. Note the 3D icon.
- Reference the desired file into the 3D model.
- Attach a GeoCS to the new model using the From Reference Tool.
- Adjust view so that the view contains the desired area to be captured. Keep in mind that too large of an area will have less resolution due to Google's compression techniques
- Select Synchronize Google Earth View icon
- In Google Earth, check and confirm view. DO NOT adjust view in any way.
Select Capture Google Earth Image icon. Next, data point in the center of the MicroStation view.
A 3D wireframe mesh will appear in the drawing covering the view area.
Next, change View Attributes, display style to "Smooth" to view the Google Image
The Google Image will appear.
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.