Measurement of Sea Ice Drift Far from Shore Using LANDSAT and Aerial Photographic Imagery.

摘要

A semi-automatic procedure for transferring the location coordinates of a common set of ice features from the Earth coordinate system of one LANDSAT image to another is discussed. Errors in the transferral technique are examined using imagery over land and are found to be dominated by deviations (as large as 8 km) in the actual position of the center of the image from its states position. A least-squares strain program, which utilizes polar coordinates to eliminate spurious effects that may occur if the coordinate system of a given floe is used as the common coordinate system, is discussed. The use of uncontrolled aerial photography to measure sea ice strain results in errors of the order of 1%. (Author)