Sea Ice Motion Vectors Data Set       These products record how far ice features moved, and through what angle they rotated, between successive ERS-1 SAR images. Each product represents about three days of sea ice motion. Each data record identifies the initial latitude and longitude of an ice feature (or gridded section of an ice feature), its final latitude and longitude, the x and y displacement it went through, and how much it rotated as well as a reliability measure. Products were generated for winter months between February 1992 and December 1994. For further information, see the detailed guide documentation for the GPS Sea Ice Motion Vectors Data Set.

Sea Ice Classification Products       These products classify the sea ice identified in the input ERS-1 SAR images. Research had shown that different sea ice types have distinctive radar backscattering properties, and those properties were used to convert the input radar backscatter data to sea ice types. The ice types identified were multi-year ice, deformed first-year ice, undeformed first-year ice, and new ice/smooth open water. Two output products are available: 1) an image colored according to sea ice classifications; and 2) a data file listing the percentage of each sea ice type found in 5 km x 5 km input image blocks. Products were generated for winter months between February 1992 and December 1994. For further information, see the detailed guide documentation for the GPS Sea Ice Classification Data Set.

Ocean Wave Products       The GPS wave spectra algorithm uses a two-dimensional Fast Fourier Transform to obtain a transformed wave number spectrum of a 512 by 512 portion of an ERS-1 image of ocean waves. This spectrum is smoothed by a Gaussian filter and the final output product is a contour plot of the spectrum power in polar coordinates with wave number as the radius and wave direction (relative to the image orientation) as the angle. Significant peaks are automatically located so that the dominant wavelengths and wavefront angles can be displayed. Due to difficulties in processing, there are only a few dozen wave products from February 1992 until December 1994. For further information, see the detailed guide documentation for the GPS Wave Spectra Data Set.