Analyses of High Resolution Bathymetric Data in the Eltanin Impact Area
High resolution bathymetric data are widely used for interpretation of the morphology of the sea floor, for geological, and geophysical research, and for the creation of bathymetric maps. The Alfred Wegener Institute for Polar and Marine Research maintains a multibeam system, called Hydrosweep DS-2,...
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| Format: | Thesis |
| Language: | unknown |
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2002
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| Online Access: | https://epic.awi.de/id/eprint/22883/ https://epic.awi.de/id/eprint/22883/1/Jac2002j.pdf https://hdl.handle.net/10013/epic.35637 https://hdl.handle.net/10013/epic.35637.d001 |
| Summary: | High resolution bathymetric data are widely used for interpretation of the morphology of the sea floor, for geological, and geophysical research, and for the creation of bathymetric maps. The Alfred Wegener Institute for Polar and Marine Research maintains a multibeam system, called Hydrosweep DS-2, for the surveying of the sea floor in the polar regions of the earth.One of these research projects, in the last years, was the Eltanin Impact Area, situated in the Bellingshausen Sea, at the western entrance of the Drake passage, in the vicinity of the Antarctic waters, and some 700 nautical miles off the Chilean coast. This Eltanin Impact Area is yet the only known impact area affecting the deep ocean basins, and the evidence for this was found in the ear ly 1980s [Kyte et al., 1981].During two expeditions, in the year 1995 (ANTXII/4) and 2001 (ANTXVIII/5a), with the German Research Vessel Polarstern this area was for the first time systematically surveyed, and bathymetric data was collected within a large area. However, during these two expeditions not only the bathymetric data were collected, but also pseudo side scan data, and backscatter data. These data formed the basis for the master research, presented in this thesis. The main tasks of this research project were first the derivation of a high resolution and accurate digital elevation model of the Eltanin Impact Area, better than 1% of the water depth, within the Geographic Information System (GIS) ArcInfo, and second the backscatter processing and analyses.For the computation of a digital elevation model different steps were undertaken. The most important step was the bathymetric data editing and cleaning, to remove the outliers, gross and systematic errors. This data editing and cleaning was performed using the software HIPS of the GIS program CARIS. The editing and cleaning procedure was split up in three parts. First the navigation editor was used to correct for navigational errors, followed by special filters within the swath editor to reject erroneous ... |
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