Enhanced Scatter Chart - Aligning data with image

Good Afternoon, 

I am looking to use the Enhanced Scatter Chart, and am having trouble figuring out how to get the data to line up with the backdrop image. For instance, I have a building floorplan and data that corresponds to specific locations on the floorplan. How do I ensure that the bubbles of the scatter chart overlay the corresponding area of the floorplan? 

Thanks in advance for any help on this!