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This pair of images illustrates the rapid growth that occured between 1973 and 1999 in San Jose, CA. From 1970 to 1996, the population of the city of San Jose increased from 459,000 to 839,000. This is reflected by an increase in urban areas in the above Landsat images, which show up as light blue.

For more information about Landsat, see the Landsat 7 Gateway

Image courtesy Landsat 7 project