Ice Stream F (Landsat)

Ice Stream F map

Access Data

Image Information

Velocity data were derived from the Landsat scenes listed below. To view image data select Velocity Map or Data Set Map, or use the links on the overview image.

Raw Images

Satellite Image ID # Path/Row Date Acquired
Landsat 5 5025117008701410 25/117 14 January 1987
Landsat 5 5019117008702010 19/117 20 January 1987
Landsat 4 4019118009003610 19/118 05 February 1990
Landsat 4 4019117009003610 19/117 05 February 1990

Corner coordinates for Ice Stream F velocity reference image

Number of Lines: 4700
Number of Samples: 3000

Upper Left -78.43817S -148.64215W
Upper Right -79.01757S -146.09076W
Lower Left -79.16091S -153.56528W
Lower Right -79.78073S -151.11651W

Data Set Information and Access

Both image co-registraion and velocity vectors are derived using the IMCORR software developed by Scambos et al. 1992 (see Related Publications). Typical co-registration errors are a few pixels. Because this error is constant for any image pair, it is treated as a systematic error within that image pair. Each cross-correlation match has an additional random error, typically about 0.3-0.5 pixels (Landsat resolution is 28.5 meters per pixel). IMCORR measures velocity as displacement divided by time separation, therefore, velocity errors scale as the inverse of the time interval. However, as time separation between the image pair increases, changes in the ice surface (e.g. crevasses, orientations, dunes, shear strain) result in fewer successful correlations.

While error in speed and error in bearing are reported, a more realistic error estimate is the combination of a systematic error of 1.5 pixels (42.75 meters) divided by time separation and a random error of 0.5 pixels (14.25 meters) divided by time separation. The reported speed and bearing errors are derived from the strength of the IMCORR feature correlation for each vector, and are therefore more related to precision than accuracy.

Access the tabular velocity data for Ice Stream F