How do I set up Google Maps to display in Earth mode? I am using google maps v3
You mean the Google Earth plugin. This gives you the equivalent of Google Earth in a browser.
http://code.google.com/apis/earth/
Here is a basic example that shows how to enable it:
http://code.google.com/apis/earth/documentation/#using_the_google_earth_api
Look at the “full example” (scroll down).
The following map types are available in the Google Maps API :
MapTypeId.ROADMAP displays the default roadmap view
MapTypeId.SATELLITE Google Earth
MapTypeId.HYBRID
MapTypeId.TERRAIN , .
. https://developers.google.com/maps/documentation/javascript/maptypes
If on Earth View you are referring to the Satellite view, you want to set your MapType as shown here .
map.setMapTypeId(google.maps.MapTypeId.SATELLITE);
Use it
map.setMapTypeId('GoogleEarthAPI');
use this after setting up all things like markers etc.
Good luck.