The Arctic Ice Cap: Depth Mapping

The first map of Arctic sea-ice thickness has been produced using data from CryoSat-2 satellite launched last year by The European Space Agency.

"The first map, shown below, shows the average thickness of the sea-ice in January and February this year, as the ice approached its annual maximum. But the real value of the project will be the ability to map changes in the thickness of the sea ice over time, as further maps are produced."

from The Economist blog Daily Chart