The Imaging application allows you to export your workspace annotations in KML format so you can overlay them onto imagery in Google Earth. All annotations in the same folder are exported to the same file.
The following procedure exports annotations only (not images). To export an image as a KML file, see Exporting an image in KML format.
To export your workspace annotations to a KML file:
NOTE: If you have Google Earth installed on your desktop, you can open the exported KML file in Google Earth.