Institution
Canadian Hydrographic Service
Government•Ottawa, Ontario, Canada•
About: Canadian Hydrographic Service is a government organization based out in Ottawa, Ontario, Canada. It is known for research contribution in the topics: Hydrography & Chart. The organization has 108 authors who have published 119 publications receiving 1621 citations. The organization is also known as: Service hydrographique du Canada.
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Stockholm University1, University of New Hampshire2, University of Alaska Fairbanks3, Scott Polar Research Institute4, Canadian Hydrographic Service5, Norwegian Mapping Authority6, University Centre in Svalbard7, Alfred Wegener Institute for Polar and Marine Research8, Science Applications International Corporation9, Johns Hopkins University Applied Physics Laboratory10, University of Barcelona11, University of New Brunswick12, University of Hawaii at Manoa13, University of Bergen14, Geological Survey of Denmark and Greenland15, Geological Survey of Canada16, California Institute of Technology17, British Oceanographic Data Centre18
TL;DR: The International Bathymetric Chart of the Arctic Ocean (IBCAO) released its first gridded bathymetric compilation in 1999 as discussed by the authors, which has since supported a wide range of Arc...
Abstract: The International Bathymetric Chart of the Arctic Ocean (IBCAO) released its first gridded bathymetric compilation in 1999. The IBCAO bathymetric portrayals have since supported a wide range of Arc ...
977 citations
Stockholm University1, University of New Hampshire2, National Institute of Oceanography, India3, University of Barcelona4, University of California, Irvine5, Alfred Wegener Institute for Polar and Marine Research6, University of Alaska Fairbanks7, Geological Survey of Canada8, Scott Polar Research Institute9, British Antarctic Survey10, Canadian Hydrographic Service11, Norwegian Mapping Authority12, Leibniz Institute of Marine Sciences13, Geological Survey of Denmark and Greenland14, University of Bergen15, University of Grenoble16, Danish Geodata Agency17, University Centre in Svalbard18, California Institute of Technology19, Russian Academy of Sciences20, Tomsk Polytechnic University21, British Oceanographic Data Centre22, Ontario Ministry of Natural Resources23, National Marine Fisheries Service24
TL;DR: The new IBCAO Ver. 4.0 has substantially more seafloor morphological information that offers new insights into a range of submarine features and processes; for example, the improved portrayal of Greenland fjords better serves predictive modelling of the fate of the Greenland Ice Sheet.
Abstract: Bathymetry (seafloor depth), is a critical parameter providing the geospatial context for a multitude of marine scientific studies. Since 1997, the International Bathymetric Chart of the Arctic Ocean (IBCAO) has been the authoritative source of bathymetry for the Arctic Ocean. IBCAO has merged its efforts with the Nippon Foundation-GEBCO-Seabed 2030 Project, with the goal of mapping all of the oceans by 2030. Here we present the latest version (IBCAO Ver. 4.0), with more than twice the resolution (200 × 200 m versus 500 × 500 m) and with individual depth soundings constraining three times more area of the Arctic Ocean (∼19.8% versus 6.7%), than the previous IBCAO Ver. 3.0 released in 2012. Modern multibeam bathymetry comprises ∼14.3% in Ver. 4.0 compared to ∼5.4% in Ver. 3.0. Thus, the new IBCAO Ver. 4.0 has substantially more seafloor morphological information that offers new insights into a range of submarine features and processes; for example, the improved portrayal of Greenland fjords better serves predictive modelling of the fate of the Greenland Ice Sheet.
116 citations
TL;DR: In this paper, a through-water photogrammetric approach was proposed to estimate bathymetry in heterogeneous seafloor environments by using feature extraction and image geometry rather than spectral radiance.
Abstract: Satellite Derived Bathymetry (SDB) is being adopted as a cheaper and more spatially extensive method for bathymetric mapping than traditional acoustic surveys, with research being conducted by the Canadian Hydrographic Service under a Government Related Initiatives Program (GRIP) of the Canadian Space Agency. Established SDB methods involve either an empirical approach, where a regression between known depths and various colour indexes is developed; or a physics-based Radiative Transfer Model (RTM) approach, where light interactions through the water column are simulated. Both methods have achieved vertical accuracies of around 1 m. However, the empirical approach is limited to areas with existing in-situ depth data, and has limited applicability in heterogeneous benthic environments, while the physics-based approach requires precise atmospheric correction. This paper proposes a through-water photogrammetric approach which avoids these limitations, in heterogeneous seafloor environments, by using feature extraction and image geometry rather than spectral radiance to estimate bathymetry. The method is demonstrated in Coral Harbour, Nunavut, Canada using a WorldView-2 stereo pair. A standard photogrammetric extraction was performed on the stereo pair, including a blunder removal and noise reduction. Apparent depths were then calculated by referencing under-water points to the extracted elevation of the water-line. Actual in-image depths were calculated from apparent depths by applying a correction factor to account for the effects of refraction at the air-water boundary. A tidal reduction brought depths to local chart datum, allowing for validation with Canadian Hydrographic Service survey data showing a mean error of 0.031 m and an RMSE of 1.178 m. The method has a similar accuracy to the two established SDB methods, allowing for its use for bathymetric mapping in circumstances where the established methods are not applicable due to their inherent limitations.
67 citations
Journal Article•
TL;DR: In this article, the general equations that relate measured quantities from all sensors to reduced depths and positions using multibeam echosounders are derived, using the method of propagation of errors.
Abstract: Depth error budgets are commonplace for single-beam echosounders, but less so for their multibeam counterparts. Position error budgets for single-beam echosounders are seldom prepared, relying rather, on the positioning system accuracy specifications. Multibeam echosounders (MBES), in addition to having their own measurement errors, have errors resulting from the measurement inaccuracies of the additional sensors, which are needed in order to compute the depth and position of each sounding. This paper presents the general equations that relate measured quantities from all sensors to reduced depths and positions using MBES systems. The error equations are derived from these, using the method of propagation of errors. A simple model for sound speed profile errors is derived, and an empirical method for estimating sounder range and beam angle errors is presented. Total error budgets for depth and position are summarized and presented using small angle approximations.
56 citations
TL;DR: In this article, Holocene lake level history and paleogeography of Lake Erie are reinterpreted with the aid of new bathymetry, existing water budget data, and published information.
48 citations
Authors
Showing all 109 results
| Name | H-index | Papers | Citations |
|---|---|---|---|
| Fred E. Stephenson | 6 | 6 | 190 |
| Peter Kielland | 6 | 10 | 82 |
| René Chénier | 5 | 10 | 99 |
| Matus Hodul | 5 | 7 | 307 |
| R. Hare | 5 | 5 | 99 |
| Shannon Nudds | 5 | 13 | 63 |
| Adam J. Kerr | 4 | 24 | 105 |
| David H. Gray | 4 | 7 | 21 |
| J. Bartlett | 4 | 6 | 54 |
| Marc-André Faucher | 4 | 4 | 46 |
| Ryan Ahola | 4 | 6 | 50 |
| N. M. Anderson | 3 | 3 | 23 |
| Richard Sanfaçon | 3 | 4 | 36 |
| C. M. I. Robin | 3 | 10 | 95 |
| R. M. Eaton | 3 | 6 | 29 |