High Resolution Mapping in support of UNCLOS Article 76: Seeing the seafloor with new eyes
Since 2003, the Center for Coastal & Ocean Mapping/Joint Hydrographic Center at the University of New Hampshire (UNH) has been conducting multibeam mapping of many U.S. continental margins in areas where there is a potential for an extended continental shelf as defined under Article 76 of the Un...
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ftuninhampshire:oai:scholars.unh.edu:ccom-1830 2023-05-15T15:17:29+02:00 High Resolution Mapping in support of UNCLOS Article 76: Seeing the seafloor with new eyes Gardner, James V. Mayer, Larry A. Armstrong, Andy 2007-05-01T07:00:00Z application/pdf https://scholars.unh.edu/ccom/830 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1830&context=ccom unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/ccom/830 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1830&context=ccom Center for Coastal and Ocean Mapping Law of the Sea Oceanography and Atmospheric Sciences and Meteorology text 2007 ftuninhampshire 2023-01-30T21:33:15Z Since 2003, the Center for Coastal & Ocean Mapping/Joint Hydrographic Center at the University of New Hampshire (UNH) has been conducting multibeam mapping of many U.S. continental margins in areas where there is a potential for an extended continental shelf as defined under Article 76 of the United Nations Convention on the Law of the Sea. UNH was directed by Congress, through funding by the National Oceanic & Atmospheric Administration, to map the bathymetry in areas in the Arctic Ocean, Bering Sea, Gulf of Alaska, Northwest Atlantic, northern Gulf of Mexico, the Northern Mariana Islands, Kingman Reef and Palmyra Atoll (Fig. 1). The purpose of these surveys is to accurately locate the 2500-m isobath and to collect the bathymetry data required to eventually determine the location of the maximum change in gradient on Figure 1. Locations and year of bathymetry mapping (yellow areas) for U.S. UNCLOS concerns. the continental rises. A total area of about 862,000 km2 has been completed; approximately 250,000 km2 remains to be mapped. The area between the ~1000 and ~4800-m isobaths has been mapped on each of the completed margins. The mapping has been conducted with multibeam echosounders (MBES) that typically collect soundings with a spacing of ~50 m or less in the focused water depths. After each area is mapped, the data are gridded at 100-m spatial resolution although higher resolution is possible in the shallower regions. The depth precision achieved on all of the cruises has been <1% of the water depth and typically has been <0.5% of the water depth, based on cross-line comparisons. Navigation on all of the cruises has been acquired with inertial-aided DGPS using commercial differential corrections that provide 2 position accuracies much better than ±5 m. All of the MBES systems used produce acoustic backscatter as well as bathymetry but the backscatter quality varies among systems and conditions. Table 1 is a summary of the mapping completed and of areas yet to be mapped for bathymetry. The data ... Text Arctic Arctic Ocean Bering Sea Law of the Sea Northwest Atlantic Alaska University of New Hampshire: Scholars Repository Arctic Arctic Ocean Bering Sea Gulf of Alaska |
institution |
Open Polar |
collection |
University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
topic |
Law of the Sea Oceanography and Atmospheric Sciences and Meteorology |
spellingShingle |
Law of the Sea Oceanography and Atmospheric Sciences and Meteorology Gardner, James V. Mayer, Larry A. Armstrong, Andy High Resolution Mapping in support of UNCLOS Article 76: Seeing the seafloor with new eyes |
topic_facet |
Law of the Sea Oceanography and Atmospheric Sciences and Meteorology |
description |
Since 2003, the Center for Coastal & Ocean Mapping/Joint Hydrographic Center at the University of New Hampshire (UNH) has been conducting multibeam mapping of many U.S. continental margins in areas where there is a potential for an extended continental shelf as defined under Article 76 of the United Nations Convention on the Law of the Sea. UNH was directed by Congress, through funding by the National Oceanic & Atmospheric Administration, to map the bathymetry in areas in the Arctic Ocean, Bering Sea, Gulf of Alaska, Northwest Atlantic, northern Gulf of Mexico, the Northern Mariana Islands, Kingman Reef and Palmyra Atoll (Fig. 1). The purpose of these surveys is to accurately locate the 2500-m isobath and to collect the bathymetry data required to eventually determine the location of the maximum change in gradient on Figure 1. Locations and year of bathymetry mapping (yellow areas) for U.S. UNCLOS concerns. the continental rises. A total area of about 862,000 km2 has been completed; approximately 250,000 km2 remains to be mapped. The area between the ~1000 and ~4800-m isobaths has been mapped on each of the completed margins. The mapping has been conducted with multibeam echosounders (MBES) that typically collect soundings with a spacing of ~50 m or less in the focused water depths. After each area is mapped, the data are gridded at 100-m spatial resolution although higher resolution is possible in the shallower regions. The depth precision achieved on all of the cruises has been <1% of the water depth and typically has been <0.5% of the water depth, based on cross-line comparisons. Navigation on all of the cruises has been acquired with inertial-aided DGPS using commercial differential corrections that provide 2 position accuracies much better than ±5 m. All of the MBES systems used produce acoustic backscatter as well as bathymetry but the backscatter quality varies among systems and conditions. Table 1 is a summary of the mapping completed and of areas yet to be mapped for bathymetry. The data ... |
format |
Text |
author |
Gardner, James V. Mayer, Larry A. Armstrong, Andy |
author_facet |
Gardner, James V. Mayer, Larry A. Armstrong, Andy |
author_sort |
Gardner, James V. |
title |
High Resolution Mapping in support of UNCLOS Article 76: Seeing the seafloor with new eyes |
title_short |
High Resolution Mapping in support of UNCLOS Article 76: Seeing the seafloor with new eyes |
title_full |
High Resolution Mapping in support of UNCLOS Article 76: Seeing the seafloor with new eyes |
title_fullStr |
High Resolution Mapping in support of UNCLOS Article 76: Seeing the seafloor with new eyes |
title_full_unstemmed |
High Resolution Mapping in support of UNCLOS Article 76: Seeing the seafloor with new eyes |
title_sort |
high resolution mapping in support of unclos article 76: seeing the seafloor with new eyes |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2007 |
url |
https://scholars.unh.edu/ccom/830 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1830&context=ccom |
geographic |
Arctic Arctic Ocean Bering Sea Gulf of Alaska |
geographic_facet |
Arctic Arctic Ocean Bering Sea Gulf of Alaska |
genre |
Arctic Arctic Ocean Bering Sea Law of the Sea Northwest Atlantic Alaska |
genre_facet |
Arctic Arctic Ocean Bering Sea Law of the Sea Northwest Atlantic Alaska |
op_source |
Center for Coastal and Ocean Mapping |
op_relation |
https://scholars.unh.edu/ccom/830 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1830&context=ccom |
_version_ |
1766347732281196544 |