Miniaturizing an aerial image can be an easy and powerful process. By reducing the depth of field, an image taken from an elevated view can be transformed. If you have Photoshop, it's pretty easy:
-Select the area that you want to remain in focus.
-Feather the selection. The higher the resolution of your image, the more feathering required.
-Inverse the selection.
-Apply a blurring filter such as the Gaussian blur. Experiment with the amounts
There are other photo editing applications out there that offer "lens blurring" effects that make this an even easier task to accomplish. I typically use ON1 Photo10 or (if on my smart phone) Snapseed.