Monday, April 30, 2012

San Francisco Before and After : 1853 to 2010


After my previous article where I was showing the growth of cities worldwide by superimposing old and new satellite pictures, I though about doing a similar thing with even older maps of cities from the 19th century. And what better city to start with than my own hometown of San Francisco, California? The view above shows a map of SF from 1869 and a satellite picture from 2010.   

Click and drag the green cursor to see the difference between the two maps. 

Wednesday, April 25, 2012

Technorati claim token PYM5X5Z4CZMB


Wondering what this post is all about? Well, if you want people to know about your blog, you need to register it to Blog Directories web sites like Technorati or Best Of The Blog, where people go to look for blogs. In order for Technorati to verify that the blog you are registering really belongs to you, it sends you a code or Token and asks you to put it somewhere in a post. Just like I'm doing right now. It also asks you to turn on RSS feed on your blog and turn off any robot-blocking configuration so that their bots can automatically read your blog and find the token.

So now you know.

Sunday, April 22, 2012

Satellite Pictures Show Growth of Cities Worldwide


CNN and NASA's Landsat department have released a series of amazing satellite pictures showing the dramatic growth of urban areas around the world in the past 30 years. The two superimposed images above show Las Vegas in 1984 and 2011. Click and drag the green cursor on the image to see the changes before and after. See how what used to be barren desert is now lush suburban lawns. Also note how Lake Mead has dramatically shrunk in the same period of time... Las Vegas grew from 520,000 people in 1986 to 1.9 million in 2011. 
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