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Gridding heterogeneous bathymetric data sets with stacked continuous curvature splines in tension
Stockholm University, Faculty of Science, Department of Geological Sciences. (Marin geologi)
Stockholm University, Faculty of Science, Department of Geological Sciences. (Marin geologi)
2011 (English)In: Marine Geophysical Researches, ISSN 0025-3235, E-ISSN 1573-0581, Vol. 32, no 4, 493-501 p.Article in journal (Refereed) Published
Abstract [en]

Gridding heterogeneous bathymetric data sets for the compilation of Digital bathymetric models (DBMs), poses specific problems when there are extreme variations in source data density. This requires gridding routines capable of subsampling high-resolution source data while preserving as much as possible of the small details, at the same time as interpolating in areas with sparse data without generating gridding artifacts. A frequently used gridding method generalizes bicubic spline interpolation and is known as continuous curvature splines in tension. This method is further enhanced in this article in order to specifically handle heterogeneous bathymetric source data. Our method constructs the final grid through stacking several surfaces of different resolutions, each generated using the splines in tension algorithm. With this approach, the gridding resolution is locally adjusted to the density of the source data set: Areas with high-resolution data are gridded at higher resolution than areas with sparse source data. In comparison with some of the most widely used gridding methods, our approach yields superior DBMs based on heterogeneous bathymetric data sets with regard to preserving small bathymetric details in the high-resolution source data, while minimizing interpolation artifacts in the sparsely data constrained regions. Common problems such as artifacts from ship tracklines are suppressed. Even if our stacked continuous curvature splines in tension gridding algorithm has been specifically designed to construct DBMs from heterogeneous bathymetric source data, it may be used to compile regular grids from other geoscientific measurements.

Place, publisher, year, edition, pages
Springer Netherlands, 2011. Vol. 32, no 4, 493-501 p.
Keyword [en]
Gridding, Ocean, Bathymetry
National Category
Geosciences, Multidisciplinary Geophysics
Research subject
Oceanography; Geology
URN: urn:nbn:se:su:diva-67231DOI: 10.1007/s11001-011-9141-1ISI: 000297371600005OAI: diva2:469682
Available from: 2011-12-27 Created: 2011-12-26 Last updated: 2012-01-20Bibliographically approved
In thesis
1. Mapping bathymetry: From measurement to applications
Open this publication in new window or tab >>Mapping bathymetry: From measurement to applications
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Surface elevation is likely the most fundamental property of our planet. In contrast to land topography, bathymetry, its underwater equivalent, remains uncertain in many parts of the World ocean. Bathymetry is relevant for a wide range of research topics and for a variety of societal needs. Examples, where knowing the exact water depth or the morphology of the seafloor is vital include marine geology, physical oceanography, the propagation of tsunamis and documenting marine habitats. Decisions made at administrative level based on bathymetric data include safety of maritime navigation, spatial planning along the coast, environmental protection and the exploration of the marine resources.

This thesis covers different aspects of ocean mapping from the collection of echo sounding data to the application of Digital Bathymetric Models (DBMs) in Quaternary marine geology and physical oceanography. Methods related to DBM compilation are developed, namely a flexible handling and storage solution for heterogeneous sounding data and a method for the interpolation of such data onto a regular lattice. The use of bathymetric data is analyzed in detail for the Baltic Sea. With the wide range of applications found, the needs of the users are varying. However, most applications would benefit from better depth data than what is presently available. Based on glaciogenic landforms found in the Arctic Ocean seafloor morphology, a possible scenario for Quaternary Arctic Ocean glaciation is developed. Our findings suggest large ice shelves around parts of the Arctic Ocean during Marine Isotope Stage 6, 130–200 ka. Steered by bathymetry, deep water from the Amerasian Basin of the Arctic Ocean flows over the central Lomonosov Ridge into the Eurasian Basin. This water mass is traced on its continuing way towards Greenland and the Fram Strait. At the Morris Jesup Rise, bathymetry plays an important role in the partial re-circulation of the water into the Amerasian Basin.

Place, publisher, year, edition, pages
Stockholm: Department of Geological Sciences, Stockholm University, 2011. 41 p.
Meddelanden från Stockholms universitets institution för geologiska vetenskaper, 344
Ocean and coastal mapping, Digital Bathymetric Model, Geographical Information System, Applications of bathymetric data, Baltic Sea, Arctic Ocean, Seafloor morphology, Ocean circulation
National Category
Other Earth and Related Environmental Sciences
Research subject
Marine Geoscience
urn:nbn:se:su:diva-57291 (URN)978-91-7447-309-4 (ISBN)
Public defence
2011-06-08, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 10:00 (English)

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Submitted.

Available from: 2011-05-12 Created: 2011-05-05 Last updated: 2013-11-06Bibliographically approved

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