June 27, 2013

Blue Marble Google Edition

Google said:

"To celebrate the sunny days of summer (in the northern hemisphere at least), today we're launching new satellite imagery for Google’s mapping products. This stunning global view is virtually cloud-free and includes refreshed imagery in more locations—giving you an even more accurate and comprehensive view of our planet's landscape. 

Our satellite imagery is usually created like a quilt: we stitch together imagery of different parts of the world. Using a process similar to how we produced the global time-lapse imagery of the Earth, we took hundreds of terabytes of data from the USGS's and NASA’s Landsat 7 satellite—sometimes dozens of photos of a single spot in the world—and analyzed the photos to compute a clear view of every place, even in tropical regions that are always at least partly cloudy.

The result is a single, beautiful 800,000 megapixel image of the world, which can be viewed in Earth and Maps when you're zoomed out to a global view. This global image is so big, if you wanted to print it at a standard resolution of 300 dots per inch you’d need a piece of paper the size of a city block! This image is then blended into our highest resolution imagery, giving a beautiful cloud-free global view and detailed images in the same seamless map."

Image Credit: NASA, USGS, Landsat 7 and Google
Explanation from: http://googleblog.blogspot.co.uk/2013/06/only-clear-skies-on-google-maps-and.html

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