3-D image processing of sea beam bathymetric data.
A digital sounding system of good performance,called the Sea Beam, has been introduced and a sounding data processing system which can draw contour maps by computer processing has been prepared by the Hydrographic Department of Japan. The Sea Beam is a swath survey system with 16 narrow beams, which can survey the topography of the seafloor in detail, and give accurate data on depth and relative position between depth points. Up to this time, contour mapping has been used as a representative expression method of seafloor topography. However, it is difficult to catch the delicate topographical features from such contour maps. In recent years three-dimensional expression of the topography has been used by means of computer processing. The technique adopted projects three-dimensional topography from various directions onto flat sheets. View maps are generally drawn by stream lines or meshes. However, the view maps have limits in expressive resolution, so they are not always 'suitable for fine topography. The author developed a method which expresses topography of the seafloor delicately, by using precise Sea Beam bathymetric data. The 3-D Image processing program expresses the topography of the seafloor with shade and color-coded depth contours, with the aid of an ink-jet scanning color plotter. The efficiency of 3-D image processing is confirmed by the application of the practical Sea Beam data in the area from the Sagami Trough to the Izu-Ogasawara Trench, which was surveyed by the Hydrographic Department in 1984 and 1985.
| Main Author: | |
|---|---|
| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1986
|
| Online Access: | http://hdl.handle.net/1834/16162 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|