gov.noaa.nmfs.inport:56631 eng UTF8 dataset digital point data Alaska Fisheries Science Center 7600 Sand Point Way N.E., Building 4 Seattle WA 98115 USA https://www.afsc.noaa.gov WWW:LINK-1.0-http--link Website Website for this organization information 0700-1700 Pacific Time resourceProvider Roberson, Nancy 7600 Sand Point Way NE Seattle WA 98115 USA nancy.roberson@noaa.gov pointOfContact 2024-02-29T00:00:00 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) 1 row 6670 column 7285 point 0 AFSC/RACE/GAP/ZIMMERMANN: Bathymetry: western Gulf of Alaska Grid 2019 creation 2019 publication NOAA/NMFS/EDM 56631 https://doi.org/10.3390/geosciences9100409 https://www.fisheries.noaa.gov/inport/item/56631 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information mapDigital 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sheet data, some over a century old, was the best descriptor of much of the shallower and inshore areas, but it was superseded by the newer multibeam and LIDAR, where available.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. The purpose for creating this data set was to provide the best available bathymetry of the western Gulf of Alaska for geospatial analysis. 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. completed Zimmermann, Mark mark.zimmermann@noaa.gov custodian notPlanned Alaska Gulf of Alaska North Pacific Ocean bathymetry grid theme DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2017-04-24 publication 8.5 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Groundfish Assessment Program project InPort otherRestrictions Cite As: Alaska Fisheries Science Center, [Date of Access]: AFSC/RACE/GAP/ZIMMERMANN: Bathymetry: western Gulf of Alaska Grid [Data Date Range], https://www.fisheries.noaa.gov/inport/item/56631. 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. otherRestrictions Use Constraints: These data are not to be used for navigation. unclassified NOAA Data Management Plan (DMP) NOAA/NMFS/EDM 56631 https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/56631.pdf WWW:LINK-1.0-http--link NOAA Data Management Plan (DMP) NOAA Data Management Plan for this record on InPort. information crossReference grid eng; US elevation imageryBaseMapsEarthCover oceans -160 -152 53 59 Zimmermann, Mark mark.zimmermann@noaa.gov distributor https://www.mdpi.com/2076-3263/9/10/409/s1 WWW:LINK-1.0-http--link https://www.mdpi.com/2076-3263/9/10/409/s1 download dataset 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). Zimmermann, Mark mark.zimmermann@noaa.gov processor