Images? These are maps!
NASA has been monitoring atmospheric chemistry with the Aura spacecraft for the last 10 years. The animated GIF above shows the change in Nitrogen Dioxide over time. NO2 is formed from fuel burned at high temperatures and is an indicator of atmospheric pollution. One of the nifty features of this data is how it captured. To keep a consistent angle of sunlight (changes in which can affect atmospheric measurements), Aura is placed in a sun-synchronous orbit. This orbit passes over the poles (roughly) and crosses the area of interest at the same time, every time.
You can see more over at their website: http://aura.gsfc.nasa.gov/index.html
Strava has published an interactive heat map of the cycling and running data they capture in their smartphone apps. If you are a cyclist or a runner, you probably know Strava. If not, it is an easy way to log your miles with your GPS-enabled smartphone. Users can name routes and even race against other users for the best time on a particular route.
I’ll admit I have contributed data to this route!
This nice animated GIF of the Territorial Evolution of the United States of America was put together by the folks at Gizmodo (http://sploid.gizmodo.com/the-formation-of-the-united-states-of-america-in-one-co-1566197764/+caseychan). It is based on maps created for the Wikepedia article (http://en.wikipedia.org/wiki/Territorial_evolution_of_the_United_States) by user Golbez (http://commons.wikimedia.org/wiki/User:Golbez).
Old maps are a fantastic resource, especially when they have been georeferenced and can be compared to conditions at other points in time. A portion of the Rumsey collection has been scanned, georeferenced, and made available here.
It turns out that not all hosting options are created equal – especially free ones! I discovered that wordpress doesn’t directly support embedded google fusion table visualizations. It appears that I will have to take a bunch of screenshots and embed links to the source maps. What a pain!