AFSC/RACE/GAP/Zimmermann: Aleutians Bathymetry Grid
Access & Use Information
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https://www.ncei.noaa.gov
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http://www.afsc.noaa.gov/RACE/groundfish/bathym...ZIP
AI_bathy.zip
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Global Change Master Directory (GCMD) Keywords
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Dates
Metadata Date | February 29, 2024 |
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Metadata Created Date | October 28, 2022 |
Metadata Updated Date | April 1, 2024 |
Reference Date(s) | 2013-05 (publication) |
Frequency Of Update | notPlanned |
Metadata Source
- ISO-19139 ISO-19139 Metadata
Harvested from NMFS AFSC
Additional Metadata
Resource Type | Dataset |
---|---|
Metadata Date | February 29, 2024 |
Metadata Created Date | October 28, 2022 |
Metadata Updated Date | April 1, 2024 |
Reference Date(s) | 2013-05 (publication) |
Responsible Party | (Point of Contact, Custodian) |
Contact Email | |
Guid | gov.noaa.nmfs.inport:22164 |
Access Constraints | Cite As: Alaska Fisheries Science Center, [Date of Access]: AFSC/RACE/GAP/Zimmermann: Aleutians Bathymetry Grid [Data Date Range], https://www.fisheries.noaa.gov/inport/item/22164., Access Constraints: These data are not to be used for navigation., Use Constraints: These data are not to be used for navigation.We consider this smooth sheet bathymetry and sediment compilation a first draft. Time did not allow for careful editing along shore where some bathymetric features such as rocks, islets and rocky reefs sometimes have depths (or elevations) associated with them. Digitization of kelp patches and comments about tide rips or strong currents also was not completed. Shorelines, defined as Mean High Water (MHW) tidal datum, could also be digitized, connecting the seafloor bathymetry with land topography and satellite imagery. Additionally, soundings from smaller scale surveys could be deleted in areas where they overlap soundings from larger scale surveys, in order to remove possible contradictions. As more bathymetry data becomes available, and as more time allows, additional bathymetry drafts will be completed.Our slow method of data editing and compilation, which relied on comparing the digitized soundings to the smooth sheets in a GIS, was vindicated by the discovery and elimination of numerous errors, such as incorrect, misplaced and missing soundings. Properly accounting for the horizontal shift from the original datum to NAD 1983 HARN was the most important part of our error-checking.There is a significant gap in hydrographic survey data in the central Aleutians surrounding part of Atka Island, most of Amlia Island, and western Seguam Pass.There is very little spatial coverage of multibeam hydrographic survey data for the Aleutian Islands, totaling only about 3% of the study area. The largest single source is from a 2005 backarc mapping cruise on the RV Thompson, which mapped approximately 9,700 km2, at nine sites, scattered through the central and western Aleutians, mostly in deeper water (Coombs et al. 2007). The second largest data set of approximately 8,900 km2is from the northeastern edge of Bowers Bank (Gardner 2003), from the U.S. Extended Continental Shelf Task Force (USECSTF), under the auspices of the United Nations Convention on the Law of the Sea (UNCLOS). Another substantial multibeam data set of 5,100 km2is from NOS which is currently mapping shallower areas of navigational importance in the Unimak Pass, Akutan Pass and Unalga Pass areas. There are 20 surveys presently available with more being completed annually, but only in the eastern Aleutians. A mapping transect from the Revellecovers about 3,400 km2in the eastern Aleutians. Another mapping effort of 2,700 km2was a cold-water corals research project funded by NPRB (North Pacific Research Board), on the RV Davidson, in 2003, which mapped 17 sites in narrow strips ranging from shallow to deep. There are other, isolated, small multibeam maps such as that covering about 59 km2by CRESP (Consortium for Risk Evaluation with Stakeholder Participation; Johnson and Stewart 2005) at Amchitka Island. |
Bbox East Long | -161 |
Bbox North Lat | 59.5 |
Bbox South Lat | 49.5 |
Bbox West Long | 169 |
Coupled Resource | |
Frequency Of Update | notPlanned |
Harvest Object Id | 8188da41-31e6-4000-9463-ecb7cd622b4f |
Harvest Source Id | 26a29bb9-50b0-47fd-920b-edc74aa6ec76 |
Harvest Source Title | NMFS AFSC |
Licence | NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose. |
Lineage | unknown |
Metadata Language | eng |
Metadata Type | geospatial |
Old Spatial | {"type": "Polygon", "coordinates": [[[169.0, 49.5], [-161.0, 49.5], [-161.0, 59.5], [169.0, 59.5], [169.0, 49.5]]]} |
Progress | completed |
Spatial Data Service Type | |
Spatial Reference System | |
Spatial Harvester | True |
Temporal Extent Begin | 1934 |
Temporal Extent End | 1993 |
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