In 1972 the Earth Resources TechÂnolÂoÂgy SatelÂlite, or LandÂsat, launched into space with a misÂsion to cirÂcle the planÂet every 16 days and take picÂtures of the Earth. For more than forty years, the LandÂsat proÂgram has creÂatÂed the longest ever conÂtinÂuÂous record of Earth’s surÂface.
Now those images are availÂable to everyÂone. And thanks to Google Earth Engine, it’s posÂsiÂble to downÂload and anaÂlyze them.
Five years ago NASA and the U.S. GeoÂlogÂiÂcal SurÂvey rewrote their proÂtoÂcols and made the images availÂable for free, trilÂlions of them, a ridicuÂlousÂly masÂsive colÂlecÂtion of picÂtures takÂen from more than 400 miles away, some of them unrecÂogÂnizÂable.
Is that green patch in the AmaÂzon basin a forÂest or a pasÂture?
But with a litÂtle help from Google’s cloud, this data has amazÂing powÂer. It used to be that only a big instiÂtuÂtion, like a uniÂverÂsiÂty or a counÂtry, had the proÂcessÂing powÂer to downÂload the data. With a sinÂgle CPU it would take months to suck down the images. Now, it only takes a few hours. With that freeÂdom, small enviÂronÂmenÂtal watchÂdog agenÂcies and monÂiÂtorÂing groups have access to the same data that the big guys have had for years. All they need to do is write the algoÂrithms to help interÂpret what they’re seeÂing.
And best of all, we can all see the results.
Watch Las Vegas grow from a dusty casiÂno town into subÂurÂban sprawl.
See the Palm Islands bloom into being off the coast of Dubai between 1984 and 2012.
One of the most devÂasÂtatÂing is to watch the herÂringÂbone of roads develÂop in the AmaÂzon over just 28 years.
DownÂload GoogleEarth’s free pluÂgÂin to view preÂcomÂputÂed datasets, like this one renÂderÂing the few remainÂing places on the Earth that are more than a kiloÂmeÂter from the nearÂest road.
RelatÂed ConÂtent:
HiroshiÂma AtomÂic BombÂing RememÂbered with Google Earth
Google Presents an InterÂacÂtive VisuÂalÂizaÂtion of 100,000 Stars
CutÂting-Edge TechÂnolÂoÂgy ReconÂstructs the BatÂtle of GetÂtysÂburg 150 Years LatÂer
Kate Rix writes about eduÂcaÂtion and digÂiÂtal media. VisÂit her webÂsite and folÂlow her on TwitÂter.



