ERS-1 Ice Motion Vector Data is generated from pairs of geocoded low resolution SAR imagery. The time separation between the repeat viewing of the same ice field depends on the orbit characteristics of the ERS-1 platform and the geographic location of the region of interest. Typical values are between 3 and 35 days. The absolute spatial displacement of ice features is measured and reported for ... every cell of the 5km SSM/I grid covered by the selected pair of images. Since each ERS-1 SAR image covers an 100x100 km area, each ice motion vector product covers approximately the same area. Individual data products are very small (about 30 KBytes) and are available electronically at http://www.asf.alaska.edu/program/sdc/project/measures. The data is presented in CEOS format.
Approval by NASA is required to obtain the raw data, though the final data products are unrestricted. Please contact ASF user services to become a NASA approved investigator.