[UFO Chicago] Google Maps vs Terraserver

[Jordan Bettis]

Google appears to get most of its aerial survey data from
<http://digitalglobe.com>. According to this:
<http://en.wikipedia.org/wiki/Google_earth> the data is "usually less than
three years old." This confirms that terraserver gets its data from USGS:
<http://en.wikipedia.org/wiki/TerraServer-USA>. Interestingly it used to
have Russian data as well.



-- 
Jordan Bettis -- Chicago Il.
  <http://neighborhoods.chicago.il.us>
    Photographs of Life in the Neighborhoods of Chicago