RADARSAT data of the SHEBA region were acquired and processed into images at the Alaska SAR Facility (ASF) in Fairbanks. The SHEBA Project Office ordered these images and sent them to the RADARSAT Geophysical Processor System (RGPS), a NASA-funded project to produce ice motion and ice thickness fields throughout the entire Arctic Ocean. The RGPS created a special ice motion data set for SHEBA.
The RGPS uses cross-correlation and feature matching techniques to identify common points in sequential, overlapping SAR images. The map below shows image outlines for January 10 and 11, 1998. The SHEBA camp was at the center of the gray box. (The jagged line is the entire SHEBA drift track).
Initially a regular 5-km grid is overlaid on the earlier image, centered on the SHEBA site, and measuring 200 x 200 km in extent. The RGPS then tracks the grid points to their new locations in the later image.
There are currently 184 such ice motion products available, each one giving the ice motion over a period of one to three days, and collectively spanning the period from November 1, 1997 to October 8, 1998. Here is the sample page.