You would probably be interested in the computer vision work of professor Nathan Jacobs over the last decade: <a href="http:&#x2F;&#x2F;cs.uky.edu&#x2F;~jacobs&#x2F;" rel="nofollow">http:&#x2F;&#x2F;cs.uky.edu&#x2F;~jacobs&#x2F;</a><p>He has done some amazing work extracting geo-location and scene structure based on daylight patterns, shadows cast by clouds, rainbows, etc in images and image sequences.