Friday, December 10, 2010

NASA SATELLITES WATCH WORLD’S CITIES GROW


Researchers used NASA’s Landsat satellite to measure and analyze urban growth among a global cross-section of 30 mid-sized cities during the 1990s, according to a two-part study presented at the Fall American Geophysical Union Meeting in San Francisco.


Preliminary results from Boston University research assistant and lead author of the NASA-funded study, Annemarie Schneider, show that some cities in the sample, including Atlanta, Georgia, Calgary, Canada, and Curitiba, Brazil, grew in area by as much as 25 percent from 1990 to 2000. More importantly, this kind of global satellite-derived analysis allows researchers to compare areas and determine spatial trends in how cities have developed.

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