title: Where is the best place to download accurate lat/long/alt data?
body: <p>I'm sure this is publicly available somewhere but my google-fu has failed me. What I'd like to do is download the most accurate lat/long/alt data available for the world. This can exclude oceanic regions. Also, I do not need addresses. Mostly, what I need is: given a lat/long what is the alt? Google Maps does not currently have altitude data available and I'd prefer not to use public web services as there is no SLA. </p>
  
  <p>The best I've been able to find has been: <a href="http://www.geonames.org/export/" rel="nofollow noreferrer">http://www.geonames.org/export/</a> ... In fact, they are also a great example of why I can't use public web services for these lookups: <a href="http://geonames.wordpress.com/2009/01/25/what-to-do-against-ddos-effects/" rel="nofollow noreferrer">http://geonames.wordpress.com/2009/01/25/what-to-do-against-ddos-effects/</a></p>
  
  <p>Thanks in advance!!!!</p>