GIS at its best: Check out the Link

http://blog.fortiusone.com/2009/12/01/dataset-of-the-day-foreclosures-by-county/

How are Aerial Surveys Gathered?

There are many ways to gather aerial surveys and historically in the past, even pigeons have been used.  Typically aerial surveys are gathered through the use of an aircraft such as the one shown (operated by Keystone Aerial Surveys Inc.) in the picture in this post.  You will notice it is necessary to cut a hole in the aircraft to mount the camera.  This type of platform will give you high resolution photos, which can be used in many various applications.  These applications include everything from engineering to forestry and even more.

For a more detailed explanation check out the article called "Remote Sensing Survey Strategy" at  http://www.searchmesh.net/default.aspx?page=1726.