Overview: Overlay allows you to drape any image over your existing topography. This allows you to compare topography and any image you have like aerial photos or yield maps. Note: You need to set a background image first.
Displayed By: Click Project Explorer > Overlay
Appearance:
Steps:1. Import some topographic survey data using File>Open.
2a. To fetch an aerial photo from Google Maps click Project Explorer > Background.
OR
2b. To import an image like a yield map, right click Project Explorer > Background > Import Image File. Adjust the image corners to rubber sheet the image into the correct location.
3. Then to drape the image Click Project Explorer > Image Drape
Example: Here is a yield map draped over existing topography.
Video Demo
http://www.screencast.com/t/Vg9r3WEZgotk