Digital marine bathymetric data are rapidly increasing in both volume and variety. These data provide new perspectives on the morphology of the seafloor. They also present a number of problems with regard to developing display methods that convey the large amount of information contained in these data. We have used digital image processing techniques to reduce and display Seabeam multibeam data for three young (less than 5 Ma) seamounts on the eastern flank of the East Pacific Rise. Navigational errors in location were corrected by identifying offsets between features observed in crossing tracks and then translating the tracks relative to a control track. Images of the seamounts were then generated using spatial filtering technique. The images reveal more information than contour maps because (1) more depth intervals can be displayed, and (2) the continuous tone nature of the images shown in shaded relief or color-coded form more readily conveys morphologic information. The images suggest a significant degree of structural control on seamount shape, more so than can be delineated by examination of contour maps alone. In one case, a chain of seamounts strikes at an angle perpendicular to the abyssal hill direction, although each seamount within the chain is elongate in a direction parallel to the hills. In another case, a polygonally shaped, flat-topped seamount overlies a region of the crust where the abyssal hills display two strike directions. Images of the third seamount demonstrate a complicated structural control on morphology, including a control on the distribution of satellite constructs. Finally, the image presentations clearly depict regions where cross tracks could not be registered because of (1) residual navigation errors and (2) the presence of steep slopes, where the depth and location estimates can vary depending on the angular relationship between the ship track azimuth and the strike of the slope. |