1 Earth, 1 metre, 1 week
Lightening the data load
The idea underlying e-CORCE is simple and affords 2 advantages: it reduces costs and, above all, data volumes. “Acquiring an image of the globe every week would require 1.3 million hard disks side by side,” explains Jean-Pierre Antikidis. “We therefore had to find technical solutions capable of handling such vast quantities of data.”
e-CORCE performs 2 tricks to achieve this feat. The 1st involves image compression—ocean imagery is compressed more than images of cities—on board the satellites, a “psycho-visual” compression that is transparent to Web users.
“Using ground stations to break up the volume of data and the Internet to make them accessible anywhere in the world is a highly original concept in the space sector. That’s why CNES has filed 4 patents to protect it.”