(via ESA Portal - Protecting the Environment - Revealed: an ice sheet on the move)
Glaciologists use satellites such as the ESA’s Envisat, JAXA’s ALOS, and CSA’s Radarsat to create the first comprehensive high-quality map of Antarctica.
The map shows the movement of the glaciers and their tributaries. The river systems extend from the center of the continent out to the ocean, and scientists are able to measure the speed of this discharge.
Thanks to the International Polar Year (IPY), new discoveries such as this are being made in order to better understand the changes of the earth over time.