GlobICE uses the ESA SAR archive to generate data products of use to the climate community concerning Arctic Ocean sea ice. By comparing satellite images of the same area taken a few days apart, common features in the sea ice cover are tracked to give an ice displacement map.
An illustration of sea ice displacement between two Envisat ASAR images taken three days apart, and the resulting ice displacement vectors derived by the GlobICE system.
Computer processing of the images allows this image comparison and feature tracking to be performed automatically to build up ice motion maps over a large area and long time period. Higher level products are derived from the ice motion maps.
The links below provide details of how the products are generated that may be helpful to users of the data. The project provides Arctic-wide estimates of:
• Sea Ice Motion
• Sea Ice Deformation
• Sea Ice Area
• Sea Ice Mass Flux through selected gateways
Ice Motion products are measured by comparing pairs of images. Ice Deformation, Ice Area and Mass Flux products are derived from the Ice Motion products. All products are generated in a Polar Stereographic map projection. Most products are on a fixed grid of data points (known as Eulerian data in fluid mechanics). Other products are in the form of continuous motion tracks (known as Lagrangian data).
Refer to the Product User's Guide for further details such as data field descriptions.
Samples of each product with visual quicklooks can be found here.