AFSC/RACE/GAP/ZIMMERMANN: Bathymetry: western Gulf of Alaska Grid
Alaska Fisheries Science Center
Data Set
(DS)
| ID: 56631
| Published / External
Created: 2019-06-06
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Last Modified: 2023-05-30
Project (PRJ) | ID: 22291
ID: 56631
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | AFSC/RACE/GAP/ZIMMERMANN: Bathymetry: western Gulf of Alaska Grid |
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Short Name | |
* Status | Completed |
Creation Date | 2019 |
Revision Date | |
• Publication Date | 2019 |
* » Abstract |
We defined the bathymetry of Shelikof Strait and the western Gulf of Alaska (WGOA) from the edges of the land masses down to about 7,000 m deep in the Aleutian Trench. We made this map by combining soundings from historical National Ocean Service (NOS) smooth sheets (2.7 million soundings); shallow multibeam and LIDAR (Light Detection and Ranging) data sets from the NOS and others (subsampled to 2.6 million soundings); and deep multibeam (subsampled to 3.3 million soundings), single-beam, and underway files from fisheries research cruises (9.1 million soundings). The legacy smooth sheet data, some over a century old, was the best descriptor of much of the shallower and inshore areas, but it was superseded by the newer multibeam and LIDAR, where available. Much of the offshore area was only described by non-hydrographic single-beam and underway files. We carefully combined these disparate data sets in an attempt to preserve seafloor features for research purposes. We also attempted to minimize bathymetric data errors so that they would not create artificial seafloor features that might impact such analyses. The main result of the bathymetry compilation is that we observe abundant features related to glaciation of the shelf of Alaska during the Last Glacial Maximum including abundant end moraines, some lateral moraines, glacial scour marks, eskers, iceberg keel marks, and two types of pock marks. We developed an integrated onshore-offshore geomorphic map of the region that includes glacial flow directions, glacial moraines, and iceberg keel marks to better define the extent of late Quaternary glaciations. |
* Purpose |
The purpose for creating this data set was to provide the best available bathymetry of the western Gulf of Alaska for geospatial analysis. |
Notes | |
Other Citation Details | |
• Supplemental Information | |
DOI (Digital Object Identifier) | https://doi.org/10.3390/geosciences9100409 |
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Keywords
Theme Keywords
Thesaurus | Keyword |
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ISO 19115 Topic Category | elevation |
ISO 19115 Topic Category | imageryBaseMapsEarthCover |
ISO 19115 Topic Category | oceans |
None | Alaska |
None | bathymetry |
None | grid |
None | Gulf of Alaska |
None | North Pacific Ocean |
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Physical Location
• » Organization | Alaska Fisheries Science Center |
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• » City | Seattle |
• » State/Province | WA |
• Country | USA |
• » Location Description |
\\AKC0SS-n086\AKC_PubliC\Dropbox\Zimm\wGOA\WGOA_bathy.zip |
Data Set Information
* Data Set Scope Code | Data Set |
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• Data Set Type | digital point data |
• Maintenance Frequency | None Planned |
Maintenance Note | |
» Data Presentation Form | Map (digital) |
• Entity Attribute Overview | |
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Distribution Liability | |
Data Set Credit | These features were digitized by Mark Zimmermann and Megan Prescott. Funding for much of the work was provided by NOAA's Essential Fish Habitat (EFH), Habitat and Ecological Processes Research (HEPR) through the Alaska NMFS Regional Office. B. McMahon, G. Nelson (retired) and especially C. Barry (Pacific Hydrographic Branch of the NOS) provided assistance with interpreting smooth sheets, bathymetric sounding files, and descriptive reports. D. Doyle and J. Benson provided valuable datum and GIS advice, respectively. D. Fischman, G. Glover, J.A. Bunn, J. Campagnoli, M. Frydrych, and M. Cole from the National Geophysical Data Center helped with accessing smooth sheets on the NGDC web site. |
Support Roles
* » Support Role | Data Steward |
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* » Date Effective From | 2019 |
Date Effective To | |
Person | Zimmermann, Mark |
Email Address | mark.zimmermann@noaa.gov |
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* » Support Role | Distributor |
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* » Date Effective From | 2019 |
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Person | Zimmermann, Mark |
Email Address | mark.zimmermann@noaa.gov |
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* » Support Role | Metadata Contact |
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* » Date Effective From | 2019 |
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Person | Roberson, Nancy |
Address |
7600 Sand Point Way NE Seattle, WA 98115 USA |
Email Address | nancy.roberson@noaa.gov |
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Currentness Reference | Publication Date |
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Grid Representation Used? | Yes |
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TIN Representation Used? | No |
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Access Information
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* » Security Class | Unclassified |
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These data are not to be used for navigation. |
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» Download URL | https://www.mdpi.com/2076-3263/9/10/409/s1 |
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Data Management
» Have Resources for Management of these Data Been Identified? | Yes |
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» Approximate Percentage of Budget for these Data Devoted to Data Management | Unknown |
» Do these Data Comply with the Data Access Directive? | Yes |
» Is Access to the Data Limited Based on an Approved Waiver? | No |
» If Distributor (Data Hosting Service) is Needed, Please Indicate | |
» Approximate Delay Between Data Collection and Dissemination | |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed | |
» Actual or Planned Long-Term Data Archive Location | To Be Determined |
» If To Be Determined, Unable to Archive, or No Archiving Intended, Explain | |
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Process Step Number | 1 |
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» Description |
While various bathymetry data have been downloaded previously from NGDC, compiled, and used for a variety of projects, our effort differed in that we compared and corrected the digital bathymetry by studying the original analog source documents - digital versions of the original survey maps, called smooth sheets. The edited smooth sheet bathymetry points, along with the digitized shoreline points, features with elevations, and superseding multibeam data set points, were processed into a solid surface of variably-sized triangles (Triangular Irregular Network or TIN) which utilized the points as corners of the triangles. The TIN was then converted by area-weighted (nearest neighbor) interpolation into a solid surface of 100 m squares (GRID). |
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Process Contact | Zimmermann, Mark |
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Email Address | mark.zimmermann@noaa.gov |
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Catalog Details
Catalog Item ID | 56631 |
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Metadata Record Created By | Nancy Roberson |
Metadata Record Created | 2019-06-06 14:17+0000 |
Metadata Record Last Modified By | SysAdmin InPortAdmin |
» Metadata Record Last Modified | 2023-05-30 18:09+0000 |
Metadata Record Published | 2022-05-18 |
Owner Org | AFSC |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2022-05-18 |
Metadata Review Frequency | 3 Years |
Metadata Next Review Date | 2025-05-18 |
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